KSSR Study Tools · Original grammar practice
Parts of Speech & Grammar Lab
Learn the building blocks of English, then practise them through 15 mini lessons and mini games. Choose a broad learning stage, then refine the library by CEFR level or K–12 ELA grade.
Two useful lenses: CEFR describes language proficiency; ELA grades describe school curriculum. They overlap, but they are not equivalent scores.
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15 skills · 13 full lessons
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Basic grammar guide
A complete sentence expresses a complete thought. It normally has a subject—who or what the sentence is about—and a predicate containing a verb. Parts of speech describe the jobs individual words perform inside that structure.
Nouns
Name a person, place, thing, or idea.
Examples: teacher, Busan, lantern, courage
Pronouns
Stand in for nouns or point to them.
Examples: she, them, ours, who
Verbs
Express actions, states, or links.
Examples: write, became, has finished
Adjectives
Describe or limit nouns and pronouns.
Examples: blue, several, patient
Adverbs
Modify verbs, adjectives, or other adverbs.
Examples: quietly, often, very
Prepositions
Show relationships in time, place, direction, or manner.
Examples: under, after, toward, with
Conjunctions
Join words, phrases, or clauses.
Examples: and, but, because, although
Interjections
Express a brief reaction or feeling.
Examples: Wow! Oh, no! Hooray!
Important: a word’s part of speech depends on its job in context. For example, light is a noun in “Turn on the light” and a verb in “Light the candle.”
Grammar reference
Full grammar units
13 lessons shown
Move from sentence foundations to advanced clarity and punctuation through complete teaching units. Each unit now includes objectives, explicit instruction, a decision routine, worked examples, common-error coaching, guided practice, independent practice, an exit ticket, and a printable answer key. The prose and activities are independently authored for KSSR; linked sources are used for topic and accuracy review rather than copied exercises.
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Beginner · 30–40 min Sentence foundations: subjects, predicates, and clauses Build complete sentences by finding the subject, the predicate, and the clause pattern.
In this unit
- Identify the complete subject and complete predicate in statements and questions.
- Distinguish independent clauses from dependent clauses and phrases.
- Explain why commands have an understood subject.
- Revise an incomplete word group into a complete, meaningful sentence.
Mini lesson
Build the sentence core
A complete sentence needs a subject and a predicate that form a finished thought.
Subject
Names who or what the sentence is about.
Ask: Who or what?Predicate
Tells what the subject does, is, has, or experiences.
Ask: What about it?The strawberries ripen in the sun.
Key terms
- subject
- who or what the sentence is about
- predicate
- what the subject does, is, has, or experiences
- finite verb
- a verb form that carries tense or agrees with a subject
- clause
- a group of words containing a subject and a verb
The sentence core
A sentence presents a complete thought. Its subject names or represents the person, place, thing, or idea being discussed. Its predicate says what the subject does, is, has, or experiences. In “The lantern flickered,” the noun phrase “the lantern” is the complete subject and “flickered” is the complete predicate.
A command can still be a complete sentence even when its subject is not written. In “Close the gate,” the understood subject is “you.” A question may place part of the verb before the subject: “Has the train arrived?” To find the core, restate it as “The train has arrived.”
Independent and dependent clauses
A clause contains a subject and a verb. An independent clause can stand alone because it completes its thought. A dependent clause begins with a word such as because, although, when, or if and leaves the reader waiting for more information.
Joining a dependent clause to an independent clause completes the meaning: “Although the path was steep, we continued.” The opening clause creates a contrast but cannot stand by itself; the second clause supplies the complete statement.
Use the core to control longer sentences
Long subjects and predicates can contain many modifiers, but the clause still rests on a subject–verb core. Reduce “The stack of blue folders beside the printer has disappeared” to “stack has disappeared.” The shorter core makes both completeness and agreement easier to inspect.
A complete sentence must also communicate a finished idea in context. “The musician who won the prize” contains a subject and verb inside a relative clause, yet the word group still needs a main predicate: “The musician who won the prize thanked her teacher.”
A dependable decision routine
- Find the finite verbLocate the verb that carries the sentence's tense.
- Ask who or whatAsk who or what performs, experiences, or is described by that verb.
- Test the thoughtRead the clause alone. If it leaves a question such as what happened next, it is dependent.
Worked examples
Find the core
The smallest boat in the harbor survived the storm.
The complete subject is “the smallest boat in the harbor.” Its head noun is “boat.” The complete predicate is “survived the storm.”
Complete the thought
Because our rehearsal ended early, we caught the first bus.
“Because our rehearsal ended early” is dependent. “We caught the first bus” is independent, so the combined sentence is complete.
Question reordered
Did the final speaker answer every question?
Restated as a statement, the core is “the final speaker did answer.” Moving the auxiliary does not remove the subject.
Command understood
Place the signed form in the green tray.
The command has the understood subject “you”; “place” begins the predicate.
Common errors—and how to repair them
Incorrect: Because the rain stopped.
Correct: Because the rain stopped, the match resumed.
Because makes the first clause dependent, so it needs an independent clause to complete the cause-and-result relationship.
Incorrect: The collection of old maps in the cabinet.
Correct: The collection of old maps is in the cabinet.
The original noun phrase has no finite verb. Adding “is” creates a predicate.
Guided practice
Work through these with the hint first, then compare your reasoning.
-
Underline the complete subject in: “The bicycle with the silver bell belongs to Hana.”
Show a hint
Find what belongs to Hana.
Check the answer
Answer: The bicycle with the silver bell
Why: The prepositional phrase belongs inside the complete subject because it identifies the bicycle.
-
Is “Whenever the library opens” independent or dependent?
Show a hint
Ask whether the words can stand alone as a finished message.
Check the answer
Answer: Dependent
Why: Whenever introduces a time relationship and makes the reader wait for the main event.
-
Complete this command's missing subject: “Please wait near the entrance.”
Show a hint
Who is being asked to wait?
Check the answer
Answer: You
Why: Commands normally address an understood “you,” even though it is not written.
Independent practice
Answer without opening the key. The explanation is there for self-correction afterward.
-
Divide “The young oak beside the fence survived the drought” into complete subject and complete predicate.
Check the answer
Answer: Subject: The young oak beside the fence. Predicate: survived the drought.
Why: The subject names the oak; the predicate reports what happened to it.
-
Explain why “After the last visitor left” is not a complete sentence.
Check the answer
Answer: After makes the clause dependent, so it does not complete the thought.
Why: The clause contains a subject and verb but still creates an unfinished time relationship.
-
Revise “The keys on the counter” into a complete sentence without changing that phrase.
Check the answer
Answer: Sample answer: The keys on the counter belong to Mr Park.
Why: The revision supplies a finite verb and completes the statement.
-
Identify the understood subject in “Turn the handle slowly.”
Check the answer
Answer: You
Why: An imperative normally omits the second-person subject because the listener is understood.
-
Does “What an extraordinary result!” contain a standard subject–predicate clause?
Check the answer
Answer: No. It is an exclamatory phrase, not a standard complete clause.
Why: Writers may use such fragments deliberately in informal or literary contexts, but the form does not contain a full clause core.
Exit ticket
Use these final checks to decide whether to continue or review the unit.
-
Is “While the soup was cooling” a complete sentence? Explain briefly.
Check the answer
Answer: No. It contains a subject and verb, but “while” makes it dependent. Add an independent clause, such as “While the soup was cooling, Mina set the table.”
Why: This response applies the unit's central decision rule in context.
-
Name the two main parts of a standard complete sentence.
Check the answer
Answer: A subject and a predicate.
Why: The subject identifies the topic; the predicate states something about it.
-
Revise “Although the bus was late” into a complete sentence.
Check the answer
Answer: Sample answer: Although the bus was late, we arrived before noon.
Why: The added independent clause completes the contrast.
Teacher notes and differentiation
- Ask learners to reduce long sentences to two-word subject–verb cores before discussing modifiers.
- Accept purposeful fragments only when learners can explain the missing structure and the intended stylistic effect.
References consulted
- Parts of Speech Overview — Topic selection and terminology cross-check.
- Sentence Structure, Variety, and Clarity — Clause and sentence-structure coverage check.
Beginner–Intermediate · 35–45 min Four sentence structures and clause connections Recognise simple, compound, complex, and compound-complex sentences and connect their clauses clearly.
In this unit
- Classify simple, compound, complex, and compound-complex sentences by clause count.
- Distinguish a compound predicate from two independent clauses.
- Select coordination or subordination to express a specific relationship.
- Revise sentence structure to improve emphasis and readability.
Mini lesson
Count and connect clauses
Sentence structure depends on clause cores and the relationship between them—not on word count.
Dependent clause
Has a subject and verb but cannot stand alone.
It leaves the reader waiting.Independent clause
Can stand alone as a complete sentence.
It carries the main message.Although the sky brightened, the boats stayed in harbor.
Key terms
- simple sentence
- one independent clause, even when the clause is long
- compound sentence
- two or more independent clauses joined correctly
- complex sentence
- an independent clause plus at least one dependent clause
- compound-complex sentence
- at least two independent clauses plus a dependent clause
Count clauses, not words
A simple sentence has one independent clause. It may be long and may contain compound subjects or verbs: “Nora and I measured the room and ordered the shelves.” The sentence is still simple because it has one clause core.
A compound sentence has at least two independent clauses. Coordinate them with a comma plus a coordinating conjunction, or with a semicolon when the relationship is already clear: “The doors opened, and the audience entered.”
Add dependent information
A complex sentence joins an independent clause to at least one dependent clause. The dependent clause can show time, cause, condition, contrast, or another relationship. When it comes first, it is usually followed by a comma: “When the doors opened, the audience entered.”
A compound-complex sentence contains at least two independent clauses and at least one dependent clause. Use it when the relationships genuinely need that structure; sentence variety should clarify ideas, not make them harder to follow.
Structure should reveal the relationship
Coordination presents ideas as grammatically equal: “The survey closed, and the team analyzed the responses.” Subordination places one idea in the background: “After the survey closed, the team analyzed the responses.” The facts are similar, but the emphasis changes.
Varying sentence structures can improve rhythm, but variety is not a goal by itself. Choose the shortest structure that expresses the relationship accurately, and split a sentence when several clause connections compete for the reader's attention.
A dependable decision routine
- Circle finite verbsMark each verb that carries tense.
- Find a subject for eachPair every finite verb with its grammatical subject.
- Label and count clausesDecide which clauses can stand alone, then classify the complete sentence.
Worked examples
Simple but expanded
The new science club planned and completed three experiments.
One subject performs two coordinated verbs within one independent clause, so the sentence is simple.
Compound-complex
After the rain stopped, the players returned, but the referee shortened the match.
The sentence has one dependent time clause and two independent clauses joined by “but.”
Compound predicate
The technician inspected the cable and replaced the damaged plug.
One subject performs two actions, so the sentence contains one independent clause and is simple.
Subordination changes emphasis
Because the evidence was incomplete, the committee postponed its decision.
The dependent because-clause explains the reason; the independent clause carries the main decision.
Common errors—and how to repair them
Incorrect: The wind rose, and knocked over the sign.
Correct: The wind rose and knocked over the sign.
The second verb shares the subject “wind”; no new independent clause begins after and.
Incorrect: When the bell rang, and the students left.
Correct: When the bell rang, the students left.
The original contains two dependent-looking pieces but no correctly formed main clause.
Guided practice
Work through these with the hint first, then compare your reasoning.
-
Classify: “Asha opened the window and watered the herbs.”
Show a hint
Count subject–finite verb pairs, not actions.
Check the answer
Answer: Simple
Why: The sentence has one subject with two verbs in one independent clause.
-
Classify: “The rain ended, but the field remained muddy.”
Show a hint
Can each side stand alone?
Check the answer
Answer: Compound
Why: Both sides of but are independent clauses.
-
Combine the ideas with subordination: The alarm sounded. We left the building.
Show a hint
Choose a word that names the time relationship.
Check the answer
Answer: Sample answer: When the alarm sounded, we left the building.
Why: The when-clause makes the timing background information.
Independent practice
Answer without opening the key. The explanation is there for self-correction afterward.
-
Classify: “The red and gold leaves covered the narrow path.”
Check the answer
Answer: Simple
Why: Compound adjectives do not create additional clauses.
-
Classify: “We stayed inside because lightning struck nearby.”
Check the answer
Answer: Complex
Why: One independent clause is joined to a dependent reason clause.
-
Classify: “Although the shop was closing, I found the book, and the clerk held it for me.”
Check the answer
Answer: Compound-complex
Why: It contains one dependent clause and two independent clauses.
-
Turn “The lights dimmed, and the film began” into a complex sentence.
Check the answer
Answer: Sample answer: When the lights dimmed, the film began.
Why: The revision makes the first event a dependent time clause.
-
Explain why word count cannot identify sentence structure.
Check the answer
Answer: Sentence structure depends on clause relationships, not length.
Why: A long simple sentence may contain many phrases, while a short compound sentence contains two independent clauses.
Exit ticket
Use these final checks to decide whether to continue or review the unit.
-
Classify this sentence: “I saved the document before the battery failed.”
Check the answer
Answer: Complex. “I saved the document” is independent, and “before the battery failed” is a dependent time clause.
Why: This response applies the unit's central decision rule in context.
-
What separates a compound predicate from a compound sentence?
Check the answer
Answer: A compound sentence has a separate subject–verb core in each independent clause.
Why: A compound predicate shares one subject.
-
Write one complex sentence that shows a cause.
Check the answer
Answer: Sample answer: Because the path was icy, the park closed early.
Why: The because-clause states the cause and the main clause states the result.
Teacher notes and differentiation
- Have learners slash between clauses and box coordinating or subordinating connectors before naming the structure.
- If clause counting is weak, return to the sentence-foundations unit rather than teaching classifications as memorised patterns.
References consulted
- Sentence Structure, Variety, and Clarity — Sentence-pattern coverage and accuracy cross-check.
Beginner–Intermediate · 35–45 min Fragments, run-ons, and comma splices Diagnose incomplete thoughts and repair clauses that have been joined without suitable punctuation.
In this unit
- Diagnose phrase fragments, dependent-clause fragments, fused sentences, and comma splices.
- Repair boundaries with a full stop, semicolon, conjunction, or subordinating word.
- Choose a repair that preserves the intended relationship between ideas.
- Distinguish accidental errors from purposeful stylistic fragments.
Mini lesson
Repair the boundary
A boundary must show where one complete thought ends and how the next thought relates.
Fragment
A phrase or dependent clause presented as a sentence.
Supply the missing core or attach it.Run-on
Independent clauses joined without a correct boundary.
Separate or connect the complete ideas.Because the rain began, we closed the windows.
Key terms
- fragment
- an incomplete word group punctuated as if it were a sentence
- fused sentence
- independent clauses joined with no boundary
- comma splice
- independent clauses joined by only a comma
- coordination
- joining equal grammatical units
Repair fragments
A fragment is punctuated like a sentence but lacks a complete independent clause. It may be a dependent clause (“Because the road was closed.”), a phrase (“Across the silent courtyard.”), or a word group missing a subject or finite verb.
Repair a fragment by attaching it to a nearby sentence or supplying the missing core. “Because the road was closed, we followed the coast” connects the reason to the result. Do not remove every short sentence: “Stop.” is a complete command with an understood subject.
Separate independent clauses
A fused sentence places independent clauses together with no boundary. A comma splice joins them with only a comma. Both problems can be fixed with a full stop, a semicolon, or a comma plus a coordinating conjunction. A subordinating word can also turn one clause into dependent information.
Choose the repair that matches the meaning. A semicolon suggests a close, balanced relationship. A conjunction names the connection: “but” marks contrast, “so” marks a result, and “yet” marks an unexpected contrast.
Do not repair punctuation mechanically
A full stop, a semicolon, and a conjunction are not interchangeable in tone. “The gate was locked. We waited” separates the facts. A semicolon highlights their close connection. “The gate was locked, so we waited” makes the result explicit.
Published writing sometimes uses fragments for dialogue, emphasis, or rhythm. Before accepting one, ask whether readers can recover the missing structure and whether the fragment creates a deliberate effect rather than accidental confusion.
A dependable decision routine
- Mark clause coresFind every subject and finite verb.
- Test each boundaryDecide whether the material on each side can stand alone.
- Name the relationshipChoose punctuation or a connector that states addition, contrast, cause, time, or result.
Worked examples
Fragment repaired
Before the final bell. → We packed our instruments before the final bell.
The original prepositional phrase has no subject-verb core. Attaching it to an independent clause completes the idea.
Comma splice repaired
The queue moved slowly, so we reviewed our notes.
The coordinating conjunction “so” works with the comma and expresses the result relationship.
Dependent fragment
Although the forecast predicted sunshine. The organizers packed tents.
Attach the opening clause: “Although the forecast predicted sunshine, the organizers packed tents.”
Fused sentence
The printer stopped we submitted the form online.
A meaningful repair is “The printer stopped, so we submitted the form online.”
Common errors—and how to repair them
Incorrect: I checked the schedule, the train had left.
Correct: I checked the schedule, but the train had left.
A comma alone cannot join two independent clauses; but also names the contrast.
Incorrect: Such as the final paragraph.
Correct: The editor revised several sections, such as the final paragraph.
The example phrase needs to attach to a complete clause.
Guided practice
Work through these with the hint first, then compare your reasoning.
-
Diagnose: “While the paint dried.”
Show a hint
What happened while it dried?
Check the answer
Answer: Dependent-clause fragment
Why: While makes the clause incomplete by creating an unfinished time relationship.
-
Repair: “The path narrowed we walked single file.”
Show a hint
Name the cause-and-result relationship.
Check the answer
Answer: Sample answer: The path narrowed, so we walked single file.
Why: So explains the result and joins two independent clauses correctly.
-
Repair the comma splice: “The room was quiet, everyone was reading.”
Show a hint
Both sides can stand alone.
Check the answer
Answer: Sample answer: The room was quiet; everyone was reading.
Why: The semicolon correctly joins two closely related independent clauses.
Independent practice
Answer without opening the key. The explanation is there for self-correction afterward.
-
Diagnose: “Across the frozen lake at dawn.”
Check the answer
Answer: Phrase fragment
Why: The group contains no subject–finite verb core.
-
Diagnose: “The bell rang the doors opened.”
Check the answer
Answer: Fused sentence
Why: Two independent clauses have no boundary.
-
Repair “I wanted to call, my phone had no signal” with a conjunction.
Check the answer
Answer: Sample answer: I wanted to call, but my phone had no signal.
Why: But states the contrast and works with the comma.
-
Repair “Because the lift was full” by adding a result.
Check the answer
Answer: Sample answer: Because the lift was full, we took the stairs.
Why: The independent clause completes the reason relationship.
-
Give one reason a skilled writer might deliberately use a fragment.
Check the answer
Answer: For emphasis, dialogue, pacing, or a controlled stylistic effect.
Why: The choice is effective only when the missing meaning remains clear.
Exit ticket
Use these final checks to decide whether to continue or review the unit.
-
Repair “The museum was closing, we returned the audio guides” in two different ways.
Check the answer
Answer: For example: “The museum was closing, so we returned the audio guides.” Or: “The museum was closing; we returned the audio guides.”
Why: This response applies the unit's central decision rule in context.
-
What is the difference between a fused sentence and a comma splice?
Check the answer
Answer: A fused sentence has no boundary; a comma splice uses only a comma.
Why: Both incorrectly join independent clauses.
-
Repair “The café closed early, we made tea at home” in one clear way.
Check the answer
Answer: Sample answer: The café closed early, so we made tea at home.
Why: The conjunction names the result.
Teacher notes and differentiation
- Require learners to identify the independent clauses before choosing a repair; punctuation-first guessing hides the underlying problem.
- Discuss multiple correct repairs and how each changes emphasis so the activity remains meaning-driven.
References consulted
- Run-ons, Comma Splices, and Fused Sentences — Error-category and repair-strategy cross-check; no exercise text reproduced.
- Sentence Fragments Exercise 1 — Fragment topic coverage only; KSSR examples and checkpoint are original.
Beginner–Intermediate · 35–45 min Subject–verb agreement Match finite verbs to their grammatical subjects, even when other words interrupt the pattern.
In this unit
- Identify the head noun of a subject phrase.
- Match present-tense verbs and forms of be to singular and plural subjects.
- Apply agreement with joined subjects, indefinite pronouns, and quantity expressions.
- Revise awkward agreement patterns for clarity.
Mini lesson
Match the true subject
The verb agrees with the head noun of the subject, not with the nearest noun.
Singular core
One shell shines; one basket rests.
Use the singular verb form.Plural core
Two shells shine; two baskets rest.
Use the plural verb form.The basket of shells rests by the door.
Key terms
- agreement
- matching a verb form to the grammatical number and person of its subject
- head noun
- the central noun that controls a larger noun phrase
- indefinite pronoun
- a pronoun such as each, everyone, or several that does not name a particular person or thing
- collective noun
- a singular-form noun naming a group
Find the true subject
In the present simple, a third-person singular subject normally takes a verb ending in -s, while plural subjects use the base form: “The device works”; “The devices work.” Forms of “be” change more visibly: “The result is”; “The results are.”
Ignore interrupting phrases when identifying the subject. In “The box of spare cables is under the desk,” the subject is the singular noun “box,” not the nearby plural noun “cables.” Turn the sentence into a short core—“The box is”—to test the agreement.
Handle joined and indefinite subjects
Subjects joined by “and” are generally plural. With “or” and “nor,” the verb usually agrees with the nearer subject: “Either the tutors or the coordinator is calling.” Rewrite awkward combinations if the agreement distracts the reader.
Many indefinite pronouns, including “each,” “everyone,” and “someone,” are singular in formal edited English. Quantifiers such as “some” depend on the noun they refer to: “Some of the rice is ready,” but “Some of the plates are ready.”
Meaning still matters
Some quantity expressions take singular or plural agreement according to what they measure. “Ten kilometres is a long walk” treats the distance as one amount, while “Ten kilometres remain unmarked” treats the kilometres as separate units.
Collective nouns vary by dialect and intended meaning. American edited English often treats “team” as singular when the group acts as one unit. If a sentence sounds strained, name the members directly instead of forcing a distracting agreement choice.
A dependable decision routine
- Cross out interruptersTemporarily ignore prepositional phrases and inserted descriptions.
- Reduce the subjectFind the head noun or pronoun that controls the verb.
- Say the short coreTest the subject and verb together before restoring the full sentence.
Worked examples
Interrupting phrase
A series of workshops begins next Monday.
The head of the subject is singular “series,” so the verb is “begins.”
Nearest subject
Neither the principal nor the teachers are available.
With “neither…nor,” the nearer subject “teachers” is plural, so “are” agrees.
Quantity as one amount
Two hours is enough time for the workshop.
The duration is treated as one amount, so the singular verb fits.
Relative clause
She is one of the researchers who work in the field station.
Who refers to plural “researchers,” so the relative-clause verb is “work.”
Common errors—and how to repair them
Incorrect: The basket of pears sit by the door.
Correct: The basket of pears sits by the door.
The singular head noun “basket,” not the nearby plural “pears,” controls the verb.
Incorrect: Every student and teacher are invited.
Correct: Every student and teacher is invited.
When every applies to each member individually, formal edited English uses a singular verb.
Guided practice
Work through these with the hint first, then compare your reasoning.
-
Choose: “The list of emergency numbers (is/are) beside the phone.”
Show a hint
Ignore “of emergency numbers.”
Check the answer
Answer: is
Why: The singular head noun “list” controls the verb.
-
Choose: “Neither the coaches nor the captain (was/were) available.”
Show a hint
Look at the noun nearest the verb.
Check the answer
Answer: was
Why: With neither…nor, the verb agrees with the nearer singular subject “captain.”
-
Choose: “Some of the equipment (needs/need) repair.”
Show a hint
Ask what “some” refers to.
Check the answer
Answer: needs
Why: Equipment is noncount and takes singular agreement here.
Independent practice
Answer without opening the key. The explanation is there for self-correction afterward.
-
Choose: “Each of the windows (has/have) a safety latch.”
Check the answer
Answer: has
Why: Each is singular.
-
Choose: “The instructions on the screen (was/were) unclear.”
Check the answer
Answer: were
Why: The plural head noun is “instructions.”
-
Choose: “Either the assistants or the manager (opens/open) the office.”
Check the answer
Answer: opens
Why: The nearer subject “manager” is singular.
-
Revise the awkward sentence “Either the manager or the assistants are responsible” so agreement is less distracting.
Check the answer
Answer: Sample answer: The assistants or the manager are responsible.
Why: Placing the plural subject nearer the verb produces a natural plural form, though the factual meaning should be preserved.
-
Explain the agreement in “Five dollars is the entrance fee.”
Check the answer
Answer: The amount is treated as one price, so the verb is singular.
Why: Meaning determines whether a quantity is one total or separate units.
Exit ticket
Use these final checks to decide whether to continue or review the unit.
-
Choose the verb: “Each of the proposals (includes/include) a budget.”
Check the answer
Answer: “Includes.” The subject is the singular indefinite pronoun “each”; “of the proposals” does not change its number.
Why: This response applies the unit's central decision rule in context.
-
What word usually controls agreement inside a long subject phrase?
Check the answer
Answer: The head noun or pronoun.
Why: Nearby nouns inside modifiers do not normally control the main verb.
-
Choose and explain: “Everyone in the two groups (receives/receive) a badge.”
Check the answer
Answer: receives
Why: Everyone is a singular indefinite pronoun.
Teacher notes and differentiation
- Use sentence cores such as “list is” and “instructions are” before introducing exceptional constructions.
- Flag dialect-sensitive collective nouns and encourage revision rather than presenting one variety as universally correct.
References consulted
- Subject–Verb Agreement — Agreement-topic coverage and rule cross-check.
- Subject–Verb Agreement Exercise — Coverage audit only; no Purdue exercise items reproduced.
Intermediate · 40–50 min Verb tense and aspect Use tense to locate an event in time and aspect to show whether it is ongoing, completed, or connected to another time.
In this unit
- Distinguish tense from grammatical aspect.
- Use simple, progressive, perfect, and perfect-progressive forms to express viewpoint.
- Maintain a coherent timeline across sentences.
- Explain why stative verbs are not normally progressive in their ordinary meanings.
Mini lesson
Place events in time
Tense locates an event; aspect shows whether it is complete, ongoing, repeated, or connected to another time.
Reference time
The point from which the writer views the event.
Look for a time marker.Verb viewpoint
The form that shows the event's timing and shape.
Check the auxiliary plus main verb.When we arrived, the stars had already appeared.
Key terms
- tense
- the grammatical location of a situation, mainly present or past in English
- aspect
- the speaker's view of an event as whole, ongoing, completed, or connected across time
- auxiliary
- a helping verb used to build tense, aspect, voice, or modality
- participle
- a verb form used with an auxiliary or as a modifier
Time and viewpoint
Tense locates a situation mainly in the present or past; modal and auxiliary combinations help express the future. Aspect shows the writer’s viewpoint. Simple forms present facts or whole events. Progressive forms use “be” plus an -ing participle to show activity in progress.
Perfect forms use “have” plus a past participle to connect an earlier event to a later reference point: “They have completed the survey” connects the completed work to now. Perfect progressive forms add duration or repeated activity: “They have been collecting responses for a week.”
Maintain a meaningful timeline
Keep the controlling tense stable unless the time relationship changes. In a past narrative, past perfect can mark an event that occurred before another past event: “By the time we arrived, the film had started.” Once the sequence is clear, excessive past perfect can sound heavy.
Some verbs describing states, such as “know,” “belong,” and “seem,” are not usually progressive in their ordinary meanings. Choose forms by meaning, not by mechanical time words alone.
Build timelines, not isolated forms
A tense choice should fit the surrounding time frame. In “We entered after the caretaker had unlocked the hall,” past perfect marks the earlier event. Once that order is established, the narrative can return to simple past without repeating had before every verb.
Present perfect connects an earlier event with the present and therefore resists finished past-time expressions in standard usage. Say “I visited Osaka last year,” but “I have visited Osaka several times.” The first locates a finished event; the second describes experience up to now.
A dependable decision routine
- Set the reference timeDecide whether the reader is looking from now, from a past moment, or from another stated time.
- Choose the viewpointAsk whether the event is a fact, in progress, already completed, or continuing across a period.
- Check neighboring verbsKeep the timeline stable unless the meaning requires a deliberate shift.
Worked examples
Present perfect
I have misplaced my pass.
The loss happened earlier, but its result matters now: the speaker does not have the pass.
Past perfect sequence
The caretaker had locked the hall before our group returned.
“Had locked” marks the earlier of two past events.
Ongoing past background
The orchestra was rehearsing when the lights failed.
Past progressive presents the rehearsal as ongoing around the shorter simple-past event.
Duration to now
Mira has been studying the samples since Tuesday.
Present perfect progressive connects an ongoing activity and its duration to the present.
Common errors—and how to repair them
Incorrect: I have finished the report yesterday.
Correct: I finished the report yesterday.
Yesterday fixes the event in a completed past time, so simple past is appropriate.
Incorrect: I am knowing the answer.
Correct: I know the answer.
Know normally describes a state rather than an unfolding action.
Guided practice
Work through these with the hint first, then compare your reasoning.
-
Choose: “By the time the guests arrived, we (prepared/had prepared) the room.”
Show a hint
Which event happened first?
Check the answer
Answer: had prepared
Why: Past perfect marks the preparation as earlier than the guests' arrival.
-
Explain the difference: “Jin writes every morning” and “Jin is writing now.”
Check the answer
Answer: The first describes a habit; the second describes an activity in progress now.
Why: Compare whole or repeated action with ongoing action.
-
Correct the timeline: “Last night I have watched the documentary.”
Show a hint
Locate the event on a finished timeline.
Check the answer
Answer: Last night I watched the documentary.
Why: The finished past-time phrase calls for simple past.
Independent practice
Answer without opening the key. The explanation is there for self-correction afterward.
-
Complete: “I ___ this book three times, so I remember the ending.” (read)
Check the answer
Answer: have read
Why: The experience remains relevant now and no finished past time is given.
-
Complete: “At eight yesterday, the team ___ the final scene.” (film)
Check the answer
Answer: was filming
Why: Past progressive shows an action in progress at a stated past time.
-
Explain the shift in “She had locked the door before she left.”
Check the answer
Answer: Past perfect marks locking as earlier than the simple-past departure.
Why: The forms make the sequence explicit.
-
Revise the unnecessary shift: “The speaker entered and begins the lecture.”
Check the answer
Answer: The speaker entered and began the lecture.
Why: Both actions belong to the same past narrative.
-
Choose: “This coat (belongs/is belonging) to my brother.”
Check the answer
Answer: belongs
Why: Belong is normally stative in this meaning.
Exit ticket
Use these final checks to decide whether to continue or review the unit.
-
What difference does aspect create between “Leah reads the report” and “Leah is reading the report”?
Check the answer
Answer: The simple form can describe a habit or whole action. The progressive form presents the reading as in progress around the reference time.
Why: This response applies the unit's central decision rule in context.
-
What does aspect add beyond tense?
Check the answer
Answer: It shows how an event unfolds or connects to a reference time.
Why: Aspect distinguishes whole, ongoing, completed, and continuing viewpoints.
-
Write one sentence using present perfect to describe experience.
Check the answer
Answer: Sample answer: I have traveled by ferry several times.
Why: The sentence describes experience up to now without a finished past-time phrase.
Teacher notes and differentiation
- Draw actual timelines and ask learners to place events before choosing verb forms.
- Treat stative-verb guidance as meaning-sensitive; some verbs become progressive when their meaning changes, as in “I am thinking about it.”
References consulted
- Active Verb Tenses — Tense and aspect inventory cross-check.
- Verbs with Helpers — Auxiliary-verb terminology cross-check.
Intermediate · 30–40 min Active and passive voice Choose active or passive voice according to focus, responsibility, evidence, and flow.
In this unit
- Identify active and passive clauses from their structure.
- Transform a transitive active clause into a grammatically complete passive clause.
- Choose voice according to focus, responsibility, evidence, and genre.
- Revise vague or unnecessary passive constructions.
Mini lesson
Choose the sentence focus
Active and passive voice describe the same event while directing attention differently.
Active voice
The doer is the grammatical subject.
Use it when the agent matters.Passive voice
The receiver is the grammatical subject.
Use it when the receiver or result matters.The gardener watered the meadow.
Key terms
- active voice
- a clause whose subject performs the action
- passive voice
- a clause whose subject receives or undergoes the action
- agent
- the person or thing that performs an action
- transitive verb
- a verb that can take a direct object
How voice changes focus
In active voice, the grammatical subject performs the action: “The committee approved the plan.” In passive voice, the subject receives the action: “The plan was approved by the committee.” A passive construction normally uses a form of “be” plus a past participle, although some passive patterns use “get.”
Active voice often names responsibility directly and uses fewer words. Passive voice is useful when the receiver deserves emphasis, when the agent is unknown or unimportant, or when a field’s conventions focus on procedures and results.
Make the choice deliberately
Passive voice is not automatically an error. The problem is an unclear or evasive choice. “Mistakes were made” hides the actor; that may be misleading when responsibility matters. By contrast, “The samples were stored at 4°C” sensibly emphasizes the samples and procedure.
When revising, identify the action, the actor, and the receiver. Put the most important known information in subject position, and include a “by” phrase only when naming the agent adds useful information.
Voice is a choice, not a moral rule
Active voice often makes responsibility and sequence easier to follow: “The committee rejected the proposal.” Passive voice is useful when the receiver matters more, the agent is unknown, or a genre convention foregrounds the process: “The samples were stored at −20°C.”
A passive sentence can still be precise. The problem is not the form itself but missing information the reader needs. “Mistakes were made” may conceal responsibility, while “Three labels were printed incorrectly by the supplier” identifies both the affected items and the agent.
A dependable decision routine
- Find the action and participantsIdentify who or what acts and who or what is affected.
- Choose the sentence focusPlace the most useful topic in subject position.
- Check the passive formA passive normally uses a form of be plus a past participle; name the agent only when it matters.
Worked examples
Active for responsibility
The finance team corrected the invoice.
The sentence clearly names who performed the correction.
Passive for result
All responses were anonymized before analysis.
The handling of the responses matters more here than the identity of the person doing it.
Process focus
The solution was heated for five minutes.
The passive foregrounds the laboratory procedure; the person heating it is not important.
Responsibility restored
The contractor installed the damaged panel.
Active voice clearly identifies who performed the action.
Common errors—and how to repair them
Incorrect: The results were showed in the graph.
Correct: The results were shown in the graph.
Passive voice requires the past participle “shown,” not the simple-past form “showed.”
Incorrect: The accident was happened at noon.
Correct: The accident happened at noon.
Happen is intransitive here and does not form this passive pattern.
Guided practice
Work through these with the hint first, then compare your reasoning.
-
Identify the voice: “The storm damaged three roofs.”
Show a hint
Ask whether the subject acts or receives the action.
Check the answer
Answer: Active
Why: The subject “storm” performs the action.
-
Change to passive: “A technician tested the alarm.”
Show a hint
Move the affected thing into subject position.
Check the answer
Answer: The alarm was tested by a technician.
Why: The object becomes the subject and the verb becomes was tested.
-
Which voice better foregrounds a laboratory method: “We weighed the sample” or “The sample was weighed”?
Show a hint
What is the paragraph's topic?
Check the answer
Answer: The sample was weighed.
Why: The passive keeps attention on the material and procedure.
Independent practice
Answer without opening the key. The explanation is there for self-correction afterward.
-
Identify the voice: “The final decision was announced on Friday.”
Check the answer
Answer: Passive
Why: The subject receives the action; the agent is omitted.
-
Change to active: “The mural was designed by local students.”
Check the answer
Answer: Local students designed the mural.
Why: The agent becomes the active subject.
-
Explain why “The documents were disappeared” is incorrect.
Check the answer
Answer: Disappear is intransitive in this use and cannot take the normal passive form.
Why: Use “The documents disappeared.”
-
Revise to identify responsibility: “The deadline was missed.”
Check the answer
Answer: Sample answer: The project team missed the deadline.
Why: The revision names the responsible agent when that information matters.
-
Write one appropriate passive sentence about a scientific procedure.
Check the answer
Answer: Sample answer: The seedlings were measured every two days.
Why: The procedure and its objects are foregrounded.
Exit ticket
Use these final checks to decide whether to continue or review the unit.
-
Revise “The final schedule was published by the coordinator” into active voice.
Check the answer
Answer: “The coordinator published the final schedule.” The coordinator becomes the subject and performs the action.
Why: This response applies the unit's central decision rule in context.
-
What two elements normally form a passive verb phrase?
Check the answer
Answer: A form of be and a past participle.
Why: Other auxiliaries may appear, but this core marks the passive.
-
Give one legitimate reason to omit the agent in a passive sentence.
Check the answer
Answer: The agent is unknown, obvious, unimportant, or deliberately backgrounded.
Why: The choice should support the sentence's focus.
Teacher notes and differentiation
- Avoid blanket instructions to remove all passive voice; compare how voice changes focus in real genres.
- Check that learners use true past participles when transforming irregular verbs.
References consulted
- Verbs: Voice and Mood — Voice terminology and purpose cross-check.
- More about Passive Voice — Appropriate-use coverage check.
Intermediate · 40–50 min Pronoun case, agreement, and reference Select pronoun forms by grammatical role and keep every reference clear and consistent.
In this unit
- Select subject, object, and possessive pronoun forms by grammatical role.
- Maintain agreement between pronouns and their antecedents.
- Recognise and repair ambiguous or remote pronoun reference.
- Use singular they appropriately and revise when reference remains unclear.
Mini lesson
Keep the reference clear
A pronoun must point to one clear antecedent and agree with it in number and person.
Antecedent
The noun or noun phrase the pronoun refers to.
Name the intended person or thing.Pronoun
A word that stands in for the antecedent.
Check clarity, number, and person.Mina switched on her lantern because she needed light.
Key terms
- pronoun case
- the form a pronoun takes for its grammatical job
- antecedent
- the word or idea a pronoun refers back to
- agreement
- consistency in person and number between a pronoun and its antecedent
- reference
- the reader's ability to identify what a pronoun means
Choose case by function
Subject forms include “I,” “he,” “she,” “we,” “they,” and “who.” Object forms include “me,” “him,” “her,” “us,” “them,” and “whom.” Remove a coordinated noun to test the form: “The coach thanked Priya and me” becomes “The coach thanked me,” not “thanked I.”
Possessive pronouns such as “mine” and “theirs” stand alone, while possessive determiners such as “my” and “their” introduce nouns. Reflexive forms such as “myself” should refer back to a matching subject or add emphasis; they should not replace ordinary subject or object forms.
Control agreement and reference
A pronoun should agree with its antecedent in number and person. Singular “they” is widely used for an unknown, nonbinary, or deliberately unspecified person and helps avoid awkward “he or she” repetition. Keep point of view steady unless there is a reason to change it.
A reference must also be unmistakable. In “When Hana called Sofia, she was worried,” “she” could name either person. Repeat a noun or restructure the sentence. Relative pronouns introduce adjective clauses; commas distinguish nonessential information from information needed to identify the noun.
Clear reference outranks mechanical substitution
Singular they is standard when a person's gender is unknown, irrelevant, or nonbinary: “Each applicant should attach their portfolio.” Agreement is still important across the sentence; do not shift unpredictably from they to he or she.
A grammatically possible pronoun can still be unclear. In “Leila called Maya after she arrived,” she could refer to either person. Naming the intended person—“after Maya arrived”—solves a meaning problem that case rules alone cannot fix.
A dependable decision routine
- Name the pronoun's jobDecide whether it is a subject, object, possessive form, or reflexive form.
- Locate the antecedentPoint to the exact noun or idea the pronoun represents.
- Read for one clear matchRevise if two nearby nouns could reasonably fit or if person and number shift.
Worked examples
Case test
Between you and me, the estimate seems low.
The preposition “between” takes object forms, so “me” is correct.
Clear reference
Hana called Sofia because Hana was worried.
Repeating the name removes the ambiguous pronoun reference.
Object of a preposition
The invitation was addressed to Mina and me.
Remove “Mina and” to hear the object form: “to me.”
Clear singular they
Every participant may revise their response once.
Their agrees in meaning with the singular, gender-neutral antecedent “every participant.”
Common errors—and how to repair them
Incorrect: Me and Luca prepared the display.
Correct: Luca and I prepared the display.
The pronouns form the compound subject, so subject case is required.
Incorrect: When Ava spoke to Noor, she was nervous.
Correct: When Ava spoke to Noor, Ava was nervous.
Repeating the intended name removes the ambiguous reference.
Guided practice
Work through these with the hint first, then compare your reasoning.
-
Choose: “The coach thanked Maya and (I/me).”
Show a hint
Remove “Maya and” and test the sentence.
Check the answer
Answer: me
Why: The pronoun is part of the verb's object.
-
Repair the reference: “The tablet was beside the notebook, but it was damaged.”
Show a hint
Which object does “it” mean?
Check the answer
Answer: Sample answer: The damaged tablet was beside the notebook.
Why: Naming the damaged object removes the ambiguity.
-
Complete consistently: “Every writer should check ___ sources before submitting.”
Show a hint
Keep the antecedent and pronoun aligned.
Check the answer
Answer: their
Why: Singular their provides concise gender-neutral agreement.
Independent practice
Answer without opening the key. The explanation is there for self-correction afterward.
-
Choose: “Between you and (I/me), the plan needs revision.”
Check the answer
Answer: me
Why: The pronoun is the object of between.
-
Choose: “Sam and (she/her) presented the findings.”
Check the answer
Answer: she
Why: The pronoun is part of the compound subject.
-
Revise the shift: “If a student has a question, you should ask after class.”
Check the answer
Answer: If a student has a question, they should ask after class.
Why: The revision keeps third-person reference consistent.
-
Repair: “The jar did not fit in the cabinet because it was too narrow.”
Check the answer
Answer: Sample answer: The jar did not fit because the cabinet was too narrow.
Why: The revision names which item was narrow.
-
Explain why reflexive “myself” is incorrect in “Please email Jo or myself.”
Check the answer
Answer: The pronoun is an ordinary object, so “me” is required.
Why: Reflexive forms normally refer back to a matching subject or add emphasis.
Exit ticket
Use these final checks to decide whether to continue or review the unit.
-
Choose and explain: “Jordan and (I/me) prepared the display.”
Check the answer
Answer: “I.” The coordinated phrase is the subject. Without “Jordan and,” the sentence is “I prepared the display.”
Why: This response applies the unit's central decision rule in context.
-
What is a pronoun's antecedent?
Check the answer
Answer: The word or idea the pronoun refers to.
Why: Clear antecedents help readers recover meaning immediately.
-
Revise: “Ari told Ben that his application was ready” so Ben's application is clearly meant.
Check the answer
Answer: Ari told Ben that Ben's application was ready.
Why: Repeating Ben removes the ambiguity.
Teacher notes and differentiation
- Teach case with grammatical roles and removal tests, not with blanket rules that compound expressions always sound formal.
- Treat singular they as standard current English while still requiring clear antecedents and consistent person.
References consulted
- Pronouns — Pronoun-category and case cross-check.
- Defining vs. Non-Defining — Relative-clause distinction cross-check.
Intermediate–Advanced · 35–45 min Modifier placement and clarity Place descriptive words and phrases beside what they modify, and supply a clear doer for opening phrases.
In this unit
- Place single-word and phrase modifiers beside the words they describe.
- Recognise misplaced, dangling, and squinting modifiers.
- Supply a logical subject after an introductory modifying phrase.
- Revise for both grammatical attachment and intended meaning.
Mini lesson
Place details beside their target
A modifier should sit close to the word it describes and must logically attach to that word.
Modifier
Adds a description, condition, place, time, or manner.
Ask what the phrase describes.Target
The exact word or phrase being described.
Place it beside the modifier.Walking through the grove, I found a silver leaf.
Key terms
- modifier
- a word, phrase, or clause that describes or limits another element
- misplaced modifier
- a modifier positioned beside the wrong possible target
- dangling modifier
- a modifier whose intended target is missing from the sentence
- squinting modifier
- a modifier placed where it could describe material on either side
Keep modifiers close
A modifier should sit near the word or idea it describes. Distance can produce an unintended meaning: “She served sandwiches to the children on paper plates” momentarily suggests that the children are on the plates. Move the phrase: “She served the children sandwiches on paper plates.”
Limiting adverbs such as “only,” “almost,” and “nearly” can change a sentence’s focus. Compare “Only Amir reviewed the draft” with “Amir reviewed only the draft.” Place the limiter immediately before the element it restricts.
Give introductory phrases a doer
An opening participial phrase normally describes the subject that follows it. “Walking through the gallery, the sculpture caught my attention” wrongly makes the sculpture seem to walk. Name the walker: “Walking through the gallery, I noticed the sculpture.”
A modifier can also squint between two possible targets. “Students who practice often improve” could mean frequent practice or frequent improvement. Rewrite the sentence to state the intended relationship precisely.
Position creates meaning
Restrictive words such as only, almost, and nearly can change the claim depending on placement. “Only Mina reviewed the draft” means nobody else reviewed it. “Mina reviewed only the draft” means she reviewed nothing else.
An opening participial phrase normally describes the subject that follows. “Walking through the gallery, the sculpture surprised me” accidentally makes sculpture the walker. Make the real doer the subject: “Walking through the gallery, I was surprised by the sculpture.”
A dependable decision routine
- Box the modifierIdentify the complete descriptive word group.
- Name its targetState exactly who or what the modifier should describe.
- Place them togetherMove the modifier or rewrite the clause so the relationship is immediate and logical.
Worked examples
Place the limiter
The editor nearly removed every footnote.
“Nearly” modifies “removed”: the editor considered or came close to removing them but did not complete the action.
Supply the doer
After comparing the two maps, we noticed a missing road.
The subject “we” clearly performs the action in the opening phrase.
Only changes scope
Noah only borrowed the camera.
In informal speech this may be understood, but “Noah borrowed only the camera” precisely limits what he borrowed.
Doer supplied
After checking every figure, the analyst submitted the report.
The subject “analyst” logically performs both checking and submitting.
Common errors—and how to repair them
Incorrect: Covered in dust, Mia opened the old trunk.
Correct: Mia opened the old trunk, which was covered in dust.
The original placement says Mia was covered in dust; the revision identifies the trunk.
Incorrect: Running for the bus, my bag fell open.
Correct: Running for the bus, I felt my bag fall open.
The added subject “I” is the logical runner.
Guided practice
Work through these with the hint first, then compare your reasoning.
-
What does only limit in “Only Priya signed the card”?
Show a hint
Look immediately after only.
Check the answer
Answer: Priya
Why: The sentence says Priya, and nobody else, signed it.
-
Repair: “Looking through the telescope, the moon appeared enormous.”
Show a hint
Who was looking?
Check the answer
Answer: Looking through the telescope, I saw an enormous moon.
Why: The revision supplies a person who can look through the telescope.
-
Move the modifier to show that the jacket is green: “Lena found a jacket in the cupboard that was green.”
Show a hint
Place the description next to its target.
Check the answer
Answer: Lena found a green jacket in the cupboard.
Why: Green now sits directly beside jacket.
Independent practice
Answer without opening the key. The explanation is there for self-correction afterward.
-
Explain the difference: “I almost read every chapter” and “I read almost every chapter.”
Check the answer
Answer: The first says the reading nearly happened; the second says most, but not all, chapters were read.
Why: Modifier position changes its scope.
-
Repair: “To finish before noon, the final section was shortened.”
Check the answer
Answer: To finish before noon, the editor shortened the final section.
Why: The revision names the person pursuing the goal.
-
Repair: “She served sandwiches to the children on paper plates.”
Check the answer
Answer: She served the children sandwiches on paper plates.
Why: The revision keeps the plates beside the sandwiches rather than the children.
-
Identify the dangling modifier: “After reading the article, the conclusion seemed weak.”
Check the answer
Answer: After reading the article
Why: The sentence does not name who read the article.
-
Write a sentence in which only clearly limits an object.
Check the answer
Answer: Sample answer: We photographed only the eastern wall.
Why: Only sits directly before the object it limits.
Exit ticket
Use these final checks to decide whether to continue or review the unit.
-
Repair the dangling modifier: “To finish before noon, the timer was set for twenty minutes.”
Check the answer
Answer: For example: “To finish before noon, we set the timer for twenty minutes.” The subject “we” can logically finish and set the timer.
Why: This response applies the unit's central decision rule in context.
-
What should immediately follow most opening participial phrases?
Check the answer
Answer: The noun or pronoun the phrase logically describes.
Why: This placement prevents a dangling modifier.
-
Revise: “Painted bright blue, the visitors admired the door.”
Check the answer
Answer: The visitors admired the door, which was painted bright blue.
Why: The revision makes door, not visitors, the painted item.
Teacher notes and differentiation
- Ask learners to draw an arrow from every modifier to its intended target before revising.
- Use meaning contrasts with only and almost; they make modifier placement visible without relying on terminology alone.
References consulted
- Sentence Clarity — Modifier-error terminology and clarity cross-check.
- Adjective or Adverb? — Word-level modifier function cross-check.
Intermediate–Advanced · 30–40 min Parallel structure Give equal grammatical form to ideas that have equal roles in a list, comparison, or paired construction.
In this unit
- Recognise equal ideas expressed in unequal grammatical forms.
- Create parallel lists, headings, comparisons, and paired constructions.
- Use parallel structure to clarify hierarchy and emphasis.
- Revise without changing the intended meaning of each item.
Mini lesson
Make equal ideas look equal
Ideas with the same grammatical role should use the same grammatical form.
Shared role
Each item answers the same question in the sentence.
Read the sentence stem with every item.Matching form
The items use parallel nouns, verbs, phrases, or clauses.
Keep the pattern consistent.Mina enjoys reading, drawing, and singing.
Key terms
- parallel structure
- matching grammatical form for ideas with equal roles
- coordinate ideas
- words or groups that hold the same grammatical rank
- correlative conjunction
- a paired connector such as both…and or not only…but also
- ellipsis
- omitting repeated words that the reader can recover
Match forms in lists
Parallel structure means expressing coordinate ideas in the same grammatical shape. A list might contain three nouns, three infinitive phrases, or three clauses. “The role requires planning, negotiating, and reporting” is easier to process than a list that shifts unpredictably between forms.
A heading or introductory phrase may supply words shared by every item. Read the stem with each item to check that the grammar and meaning fit. Parallelism is not merely decorative; it shows readers which ideas belong at the same level.
Balance paired ideas
Correlative pairs—“both…and,” “either…or,” “neither…nor,” and “not only…but also”—should introduce matching structures. “The course is both demanding and rewarding” balances two adjectives.
Comparisons also need equivalent terms. “The library’s weekday hours are longer than the community center’s” compares hours with hours. Without the possessive substitute, the sentence could appear to compare hours with a building.
Parallelism shows readers what belongs together
Parallel structure is not merely decorative repetition. In instructions, headings, and arguments, matching forms reveal that items occupy the same level. A list beginning with “to compare” should not suddenly shift to “evaluation of” unless the hierarchy truly changes.
Do not sacrifice accuracy just to force identical wording. First decide whether the ideas are logically equal; then choose a form that expresses each one naturally. Sometimes the best repair is to split an overloaded list into two sentences.
A dependable decision routine
- Find the shared stemIdentify the words that introduce every item.
- Label each formMark items as nouns, infinitives, -ing forms, phrases, or clauses.
- Choose one patternRevise every equal item into the clearest common form.
Worked examples
Balanced list
Our plan is to interview residents, to map the route, and to publish the findings.
Each item begins with an infinitive, so the three goals have equal form.
Correlative pair
The update not only fixed the error but also improved loading speed.
Both parts contain a past-tense verb phrase.
Headings aligned
The three headings were “Planning the study,” “Collecting evidence,” and “Reporting the findings.”
Each heading uses an -ing phrase and represents one stage of the process.
Comparison repaired
Reading the original is more useful than relying on a summary.
The sentence compares one -ing phrase with another.
Common errors—and how to repair them
Incorrect: The role requires patience, accuracy, and to communicate clearly.
Correct: The role requires patience, accuracy, and clear communication.
All three objects are now noun phrases.
Incorrect: She not only revised the introduction but also the conclusion was shortened.
Correct: She not only revised the introduction but also shortened the conclusion.
Both halves now contain parallel verb phrases sharing the same subject.
Guided practice
Work through these with the hint first, then compare your reasoning.
-
Revise: “We planned to interview residents, mapping the route, and a report.”
Show a hint
Read the stem “planned” with each item.
Check the answer
Answer: We planned to interview residents, to map the route, and to write a report.
Why: All three goals use infinitive phrases.
-
Complete in parallel form: “The device is small, reliable, and ___.”
Show a hint
Match the form of small and reliable.
Check the answer
Answer: Sample answer: affordable
Why: Three adjectives create a balanced description.
-
Repair: “The new policy is both practical and it saves money.”
Show a hint
Identify the form after both.
Check the answer
Answer: The new policy is both practical and economical.
Why: Both sides of both…and are adjectives.
Independent practice
Answer without opening the key. The explanation is there for self-correction afterward.
-
Revise: “The workshop focused on planning, to draft, and revision.”
Check the answer
Answer: The workshop focused on planning, drafting, and revising.
Why: The objects of on use parallel -ing forms.
-
Revise the comparison: “Her analysis is clearer than the earlier report.”
Check the answer
Answer: Her analysis is clearer than the analysis in the earlier report.
Why: The revision compares analysis with analysis rather than analysis with a report.
-
Complete: “The guide asked us to move quietly, speak softly, and ___.”
Check the answer
Answer: Sample answer: wait patiently
Why: A base-form verb plus adverb matches the first two items.
-
Explain why “to design, testing, and production” is difficult to scan.
Check the answer
Answer: The coordinate items shift among an infinitive, an -ing form, and a noun.
Why: Readers cannot immediately see their equal status.
-
Write one sentence using not only…but also with parallel verb phrases.
Check the answer
Answer: Sample answer: The update not only fixed the error but also reduced loading time.
Why: Each half contains a past-tense verb phrase.
Exit ticket
Use these final checks to decide whether to continue or review the unit.
-
Revise “Maya enjoys sketching, to swim, and bicycle rides” so the list is parallel.
Check the answer
Answer: For example: “Maya enjoys sketching, swimming, and cycling.” All three activities use -ing forms.
Why: This response applies the unit's central decision rule in context.
-
What should be parallel in a list?
Check the answer
Answer: Items that perform equal grammatical and logical roles.
Why: Matching form makes their hierarchy visible.
-
Revise: “Mina likes hiking, to paint, and puzzles.”
Check the answer
Answer: Mina likes hiking, painting, and solving puzzles.
Why: All three objects use -ing forms.
Teacher notes and differentiation
- Have learners label each list item's grammatical form before revising; visual alignment often reveals the mismatch.
- Check logical equality as well as surface form. Parallel wording cannot rescue a list whose ideas belong at different levels.
References consulted
- Parallel Structure — Parallelism coverage and terminology cross-check.
- Sentence Clarity — Sentence-level parallelism cross-check.
Beginner–Intermediate · 40–50 min Articles and count/noncount nouns Choose a, an, the, or no article by considering countability, number, and whether a reference is identifiable.
In this unit
- Distinguish count nouns from noncount nouns in a particular meaning.
- Choose a, an, the, or no article according to number and identifiability.
- Use unit expressions to quantify noncount nouns.
- Recognise nouns whose countability changes with meaning.
Mini lesson
Count the noun correctly
Count nouns can take a number or a/an; noncount nouns use quantity expressions instead.
Count noun
Names separable units: one shell, three shells.
Use a/an or a number when appropriate.Noncount noun
Names material or an undivided category: sand, water.
Use some, much, or a unit phrase.We found a shell beside some sand.
Key terms
- count noun
- a noun that can name separate countable units
- noncount noun
- a noun treated as a substance, category, or undivided quantity
- indefinite article
- a or an, used with one nonspecific singular count noun
- definite article
- the, used when the intended referent is identifiable
Countability controls the pattern
A count noun can be counted as separate units: one ticket, two tickets. A singular count noun usually needs a determiner, such as “a ticket,” “the ticket,” or “my ticket.” A noncount noun names material, information, or an abstract quantity not normally divided into separate units: “equipment,” “advice,” and “water.”
Some nouns change category by meaning. “Chicken” can mean an animal and be countable, or food and be noncount. To count a noncount idea, add a unit expression: “two pieces of advice” or “three bottles of water.”
Choose the article by reference
Use “a” or “an” for one nonspecific member of a group. The choice follows sound, not spelling: “an hour” begins with a vowel sound, while “a university” begins with a /y/ sound. Use “the” when the listener can identify the particular referent from context, shared knowledge, or a defining phrase.
Plural count nouns and noncount nouns often take no article when they refer generally: “Libraries preserve knowledge.” Once the reference becomes specific, use “the”: “The knowledge in this archive is restricted.”
Article choice builds a shared reference
Writers often introduce a new singular count noun with a or an, then use the after it becomes identifiable: “A package arrived. The package had no label.” The shift guides the reader from new information to shared reference.
Countability belongs to a meaning, not permanently to a spelling. “We ordered chicken” treats chicken as food, while “Three chickens crossed the road” counts animals. Learner dictionaries mark these patterns and are useful when intuition is uncertain.
A dependable decision routine
- Check the noun's meaningDecide whether it names one unit, several units, or an undivided idea in this sentence.
- Ask whether it is identifiableDetermine whether the listener can know the particular referent.
- Choose the determinerUse a/an, the, another determiner, a unit expression, or no article.
Worked examples
First and later mention
I found a key. The key opened the side door.
The first sentence introduces one unspecified key; the second refers to the now-identifiable key.
Count a noncount noun
The technician gave us two pieces of useful information.
“Information” remains noncount, while “pieces” provides countable units.
General plural
Museums preserve objects and knowledge.
The plural count noun and noncount noun make general statements, so neither needs an article.
Unit expression
The adviser gave me three pieces of practical advice.
Advice remains noncount; pieces provides countable units.
Common errors—and how to repair them
Incorrect: She gave me an advice.
Correct: She gave me some advice.
Advice is normally noncount, so it does not take an in this meaning.
Incorrect: We visited a university near the station and university had a library.
Correct: We visited a university near the station, and the university had a library.
The second mention is now identifiable and takes the.
Guided practice
Work through these with the hint first, then compare your reasoning.
-
Choose: “We need (a/some) new equipment.”
Show a hint
Can you count one equipment, two equipments?
Check the answer
Answer: some
Why: Equipment is noncount in this meaning.
-
Choose: “She is (a/an) honest witness.”
Show a hint
Listen to the first sound, not the first letter.
Check the answer
Answer: an
Why: Article choice follows the initial vowel sound; h is silent in honest.
-
Complete the second mention: “I saw a fox. ___ fox disappeared into the trees.”
Show a hint
Is the animal now known to the reader?
Check the answer
Answer: The
Why: The first sentence makes the particular fox identifiable.
Independent practice
Answer without opening the key. The explanation is there for self-correction afterward.
-
Choose: “Could you give me (an information/some information)?”
Check the answer
Answer: some information
Why: Information is normally noncount.
-
Choose: “We waited for (a/an) hour.”
Check the answer
Answer: an
Why: Hour begins with a vowel sound.
-
Explain the difference between “I like coffee” and “I ordered a coffee.”
Check the answer
Answer: The first names coffee generally as a drink; the second counts one serving.
Why: Countability changes with meaning.
-
Add articles where needed: “Student borrowed book beside window.”
Check the answer
Answer: A student borrowed the book beside the window.
Why: A introduces a nonspecific student; the defining phrase identifies the book and window in context.
-
Write a unit expression for advice.
Check the answer
Answer: Sample answer: two pieces of advice
Why: The countable noun pieces measures the noncount noun advice.
Exit ticket
Use these final checks to decide whether to continue or review the unit.
-
Choose the articles: “We waited for (a/an) hour beside (a/the) entrance named on our tickets.”
Check the answer
Answer: “An hour” because “hour” begins with a vowel sound; “the entrance” because the defining phrase identifies a particular entrance.
Why: This response applies the unit's central decision rule in context.
-
What determines whether to use a or an?
Check the answer
Answer: The first sound of the following word, not simply its first letter.
Why: Use an before vowel sounds and a before consonant sounds.
-
Why does “the report on my desk” take the?
Check the answer
Answer: The defining phrase identifies a particular report.
Why: The listener can locate the intended referent.
Teacher notes and differentiation
- Teach article choice as a meaning and shared-reference system, not as a list of isolated exceptions.
- Encourage learners to record countability with example phrases, because direct translation often hides English patterns.
References consulted
- Count and Noncount Nouns — Countability and article-pattern cross-check.
Beginner–Intermediate · 35–45 min Prepositions and logical relationships Use prepositional phrases to express place, time, direction, method, cause, and other relationships precisely.
In this unit
- Identify complete prepositional phrases and their objects.
- Classify relationships of place, time, direction, means, cause, and association.
- Choose conventional adjective–preposition and verb–preposition combinations.
- Revise stacked phrases that obscure a sentence's core.
Mini lesson
Map the relationship
A preposition begins a phrase that relates its object to another idea in the sentence.
Preposition
Names a relationship such as place, time, direction, or method.
Locate the relationship word.Object
Completes the phrase with a noun or pronoun.
Find what follows the preposition.The leaf rested under the bridge.
Key terms
- preposition
- a word that introduces a relationship
- object of a preposition
- the noun phrase or pronoun completing that relationship
- prepositional phrase
- a preposition, its object, and any modifiers
- collocation
- a conventional combination of words used together
Build the phrase
A preposition connects its object to another element in the sentence. The object is usually a noun phrase or pronoun: “beneath the old bridge,” “after lunch,” and “between you and me.” The entire prepositional phrase can modify a noun, a verb, or a larger clause.
Prepositions express more than physical position. They can mark time (“during the break”), direction (“toward the exit”), means (“by train”), cause (“from exhaustion”), possession or association (“the cover of the book”), and many other relationships.
Prefer the conventional relationship
Many preposition choices are conventional combinations rather than rules that can be translated word for word: interested in, responsible for, depend on. Record these combinations as phrases and check a reliable learner dictionary when uncertain.
A final preposition is often natural in English questions and relative clauses: “Which team are you working with?” Extremely formal alternatives may be possible, but clarity and audience should guide the choice. Remove strings of unnecessary prepositional phrases when they bury the sentence core.
Learn patterns in meaningful phrases
Many preposition choices are conventional: interested in, responsible for, depend on. Memorising the preposition alone is less useful than recording a complete phrase and a natural sentence. A reliable learner dictionary shows both the pattern and its meaning.
Several correct phrases can express different relationships. “We met at the station” names a point, “in the station” places the meeting inside, and “near the station” gives proximity. Select the relationship the reader actually needs.
A dependable decision routine
- Bracket the whole phraseStart at the preposition and include its complete object.
- Ask what it modifiesConnect the phrase to a noun, verb, adjective, or larger clause.
- Name the relationshipState whether it expresses location, time, direction, method, cause, or another precise link.
Worked examples
Phrase modifying a noun
The folder on the upper shelf contains the receipts.
“On the upper shelf” identifies which folder.
Phrase modifying a verb
We traveled by ferry after sunset.
“By ferry” expresses means, while “after sunset” expresses time.
Relationship changes
The cat jumped onto the table and slept on the table.
Onto expresses movement to a surface; on expresses a resting location.
Conventional combination
The committee is responsible for reviewing every application.
Responsible conventionally combines with for before the responsibility.
Common errors—and how to repair them
Incorrect: We discussed about the proposal.
Correct: We discussed the proposal.
Discuss is transitive in this pattern and does not take about.
Incorrect: Between you and I
Correct: Between you and me
The pronoun is the object of the preposition between, so object case is required.
Guided practice
Work through these with the hint first, then compare your reasoning.
-
Identify the phrase and relationship: “The parcel arrived after lunch.”
Show a hint
Start with after and include its object.
Check the answer
Answer: after lunch; time
Why: The phrase modifies arrived by locating the event in time.
-
Choose: “She is interested (in/on) marine biology.”
Show a hint
Recall the complete collocation.
Check the answer
Answer: in
Why: Interested in is the conventional combination.
-
Choose: “The child ran (in/into) the room.”
Show a hint
Is the sentence describing location or direction?
Check the answer
Answer: into
Why: Into expresses movement from outside to inside.
Independent practice
Answer without opening the key. The explanation is there for self-correction afterward.
-
Identify both phrases: “The path through the forest ends at the river.”
Check the answer
Answer: through the forest; at the river
Why: The first identifies the path; the second locates where it ends.
-
Choose: “The train arrived (at/in) platform six.”
Check the answer
Answer: at
Why: At identifies a particular point.
-
Correct: “This result depends of the sample size.”
Check the answer
Answer: This result depends on the sample size.
Why: Depend on is the conventional combination.
-
Explain the difference between “on the wall” and “onto the wall.”
Check the answer
Answer: On describes location; onto describes movement to the surface.
Why: The second includes a directional change.
-
Revise to reduce stacking: “The report on the effects of noise on sleep in adolescents was published.”
Check the answer
Answer: Sample answer: Researchers published a report about how noise affects adolescent sleep.
Why: The revision restores a clear verb and replaces the chain of prepositional phrases with a clause.
Exit ticket
Use these final checks to decide whether to continue or review the unit.
-
In “The path through the orchard leads to the lake,” identify both prepositional phrases and their jobs.
Check the answer
Answer: “Through the orchard” modifies “path” by identifying it. “To the lake” modifies “leads” by expressing direction.
Why: This response applies the unit's central decision rule in context.
-
What completes a prepositional phrase?
Check the answer
Answer: The preposition's object, including any modifiers.
Why: The whole phrase expresses a relationship.
-
Choose and explain: “We traveled (by/on) train.”
Check the answer
Answer: by train
Why: By conventionally expresses the means of transport when no determiner is present.
Teacher notes and differentiation
- Use maps and timelines to establish literal relationships before teaching abstract collocations.
- Allow dialect and register variation where documented; require learners to explain the intended relationship rather than guess a single universal preposition.
References consulted
- Parts of Speech Overview — Preposition function and terminology cross-check.
Intermediate · 45–55 min Commas, semicolons, and sentence boundaries Use punctuation to show clause structure, introductory elements, lists, and nonessential information.
In this unit
- Use commas to mark clause boundaries, introductory elements, series, and nonessential information.
- Use semicolons between closely related independent clauses and complex list items.
- Distinguish structural punctuation from pauses in speech.
- Punctuate sentences by analysing grammar and meaning.
Mini lesson
Show the sentence architecture
Punctuation should match the completeness and relationship of the ideas on both sides.
Comma + connector
Joins independent clauses and names their relationship.
Use and, but, so, or another coordinator.Semicolon
Joins closely related independent clauses without a coordinator.
Both sides must stand alone.The rain stopped; the path remained wet.
Key terms
- coordinating conjunction
- a connector such as and, but, or, nor, for, so, or yet
- introductory element
- a clause or phrase placed before the main clause
- nonessential information
- supplementary material not required to identify the noun
- semicolon
- a boundary joining related independent clauses or separating complex list items
Commas reveal structure
Use a comma before a coordinating conjunction that joins two independent clauses: “I checked the figures, but the total remained unchanged.” Do not automatically insert a comma before every conjunction; a compound verb within one clause usually needs none.
A comma commonly follows an introductory dependent clause or a substantial introductory phrase. Commas also separate items in a series. The serial comma before the final conjunction can prevent ambiguity, especially when list items contain their own conjunctions.
Set off nonessential information
Nonessential material adds information but is not needed to identify the noun or complete the core meaning, so it is enclosed by paired commas: “My tablet, which is five years old, still works.” Essential information is not set off: “The tablet that has the cracked screen is mine.”
A semicolon can join closely related independent clauses without a coordinating conjunction. It can also separate complicated list items that already contain commas. A semicolon is not a decorative pause; text on both sides must fit its grammatical job.
Punctuation is a map of structure
A comma before and is appropriate when and joins two independent clauses: “I saved the file, and the screen went dark.” It is usually unnecessary when one subject has two verbs: “I saved the file and closed the laptop.” Clause analysis explains the difference.
A semicolon must join units that can support it. Between clauses, both sides must be independent. In a complicated series, semicolons separate items that already contain commas: “We visited Busan, Korea; Osaka, Japan; and Taipei, Taiwan.”
A dependable decision routine
- Mark clause coresIdentify independent and dependent clauses before adding punctuation.
- Locate structural additionsFind introductory, parenthetical, list, and nonessential material.
- Choose the boundaryUse punctuation that shows the grammatical relationship rather than merely recording a pause.
Worked examples
Independent clauses
The forecast looked clear; we packed rain jackets anyway.
Both sides can stand alone, and the semicolon highlights their close contrast.
Nonessential information
Dr Han, our newest adviser, will lead the workshop.
The name already identifies the person, so the descriptive appositive is additional and takes paired commas.
Introductory clause
Although the road was clear, we drove slowly.
The comma marks the end of the opening dependent clause.
Complex series
The panel included Amina, the chair; Tomas, the treasurer; and Lin, the secretary.
Semicolons keep the three items clear because each contains an internal comma.
Common errors—and how to repair them
Incorrect: The results were surprising, however, we checked them twice.
Correct: The results were surprising; however, we checked them twice.
However is not a coordinating conjunction; a semicolon or full stop must separate the independent clauses.
Incorrect: I packed a coat, and carried an umbrella.
Correct: I packed a coat and carried an umbrella.
One subject performs both verbs, so no independent-clause boundary occurs.
Guided practice
Work through these with the hint first, then compare your reasoning.
-
Add punctuation: “When the doors opened the audience entered.”
Show a hint
Find where the main clause begins.
Check the answer
Answer: When the doors opened, the audience entered.
Why: A comma closes the introductory dependent clause.
-
Choose a boundary: “The data were incomplete ___ we postponed the decision.”
Show a hint
Name the relationship between the clauses.
Check the answer
Answer: Sample answer: The data were incomplete, so we postponed the decision.
Why: Comma plus so correctly joins the independent clauses and states the result.
-
Does this need a comma? “Mina opened the folder and read the first page.”
Show a hint
Is there a new subject after and?
Check the answer
Answer: No
Why: The two verbs share one subject and form a compound predicate.
Independent practice
Answer without opening the key. The explanation is there for self-correction afterward.
-
Punctuate: “The storm ended but the roads remained flooded.”
Check the answer
Answer: The storm ended, but the roads remained flooded.
Why: But joins two independent clauses.
-
Punctuate: “Before leaving the laboratory we cleaned every surface.”
Check the answer
Answer: Before leaving the laboratory, we cleaned every surface.
Why: The comma marks the substantial introductory phrase.
-
Join with a semicolon: “The forecast was uncertain. We packed extra water.”
Check the answer
Answer: The forecast was uncertain; we packed extra water.
Why: Both clauses are independent and closely related.
-
Explain why a comma alone cannot join “The bell rang, everyone left.”
Check the answer
Answer: Both sides are independent clauses, so the comma creates a comma splice.
Why: Use a full stop, semicolon, or comma plus conjunction.
-
Write a three-item series in which semicolons improve clarity.
Check the answer
Answer: Sample answer: The teams came from Lima, Peru; Quito, Ecuador; and Bogotá, Colombia.
Why: Each item contains an internal comma, so semicolons separate the larger units.
Exit ticket
Use these final checks to decide whether to continue or review the unit.
-
Add punctuation: “Although the lift was working we took the stairs and we reached the lobby first.”
Check the answer
Answer: “Although the lift was working, we took the stairs, and we reached the lobby first.” The first comma closes the introductory dependent clause; the second helps join two independent clauses with “and.”
Why: This response applies the unit's central decision rule in context.
-
When should a comma normally appear before a coordinating conjunction?
Check the answer
Answer: When the conjunction joins two independent clauses.
Why: A shared-subject compound predicate usually does not need that comma.
-
What must be true of clauses joined by a semicolon?
Check the answer
Answer: Each clause must be able to stand independently.
Why: The semicolon marks a close relationship but does not make a fragment complete.
Teacher notes and differentiation
- Make learners mark clause boundaries before discussing comma rules; auditory pauses are unreliable.
- Present house-style choices such as the serial comma separately from structural errors, and state which convention the course uses.
References consulted
- Extended Rules for Commas — Comma-use coverage and rule cross-check.
- Commas vs. Semicolons — Clause-boundary distinction cross-check.
- Commas with Nonessential Elements — Essential/nonessential distinction cross-check.
Intermediate–Advanced · 40–50 min Appositives and relative clauses Expand noun phrases with renaming and describing structures while controlling meaning and punctuation.
In this unit
- Identify appositives and relative clauses inside noun phrases.
- Distinguish defining information from supplementary information.
- Use paired commas around nonessential appositives and relative clauses.
- Explain how punctuation changes the set of people or things a sentence describes.
Mini lesson
Decide what identifies the noun
Defining information identifies the referent; supplementary information adds a comment about an already clear referent.
Defining
Needed to identify which person or thing is meant.
Do not set it off with commas.Supplementary
Adds information about an already identified referent.
Use paired commas around it.Ms Ortiz, our debate coach, opened the meeting.
Key terms
- appositive
- a noun or noun phrase placed beside another noun to rename it
- relative clause
- a clause beginning with a relative word that modifies a noun
- defining information
- information needed to identify the intended member or group
- supplementary information
- additional information about an already identified referent
Rename with appositives
An appositive is a noun or noun phrase placed beside another noun to rename or explain it. “Our guide, an experienced climber, checked every rope” adds a description of an already identified guide. Because the information is supplementary, paired commas mark its boundaries.
An essential appositive identifies which person or thing is meant and normally takes no commas: “The scientist Marie Curie won two Nobel Prizes.” Whether information is essential depends on the intended meaning and context, not on length alone.
Describe with relative clauses
A relative clause begins with a relative word such as “who,” “which,” or “that” and modifies a noun. A defining clause identifies the noun: “Students who submit by Friday receive feedback.” Removing the clause would change which students are included.
A non-defining clause comments on an already identified noun and is enclosed by commas: “This report, which I revised yesterday, is ready.” In careful edited usage, “which” commonly introduces a non-defining clause and “that” a defining clause, though actual usage varies.
Commas can change who is included
In “The students who completed the survey received certificates,” the defining clause selects a subgroup. In “The students, who completed the survey, received certificates,” the commas present all of the students as survey completers. Punctuation therefore changes the factual claim.
Context determines whether a name or description is identifying. “My brother Daniel” may need no commas if the writer has more than one brother. “My brother, Daniel,” presents Daniel as the writer's only relevant brother. Do not decide solely by phrase length.
A dependable decision routine
- Identify the nounName the person or thing being renamed or described.
- Test removalRemove the added material and ask whether the reader can still identify the same referent.
- Punctuate the meaningUse no commas for defining information and paired commas for supplementary information.
Worked examples
Essential appositive
My cousin Dae lives in Busan.
If the writer has more than one cousin, “Dae” identifies which cousin and takes no commas.
Non-defining clause
The west wing, which reopened in May, contains the archive.
“The west wing” is already specific; the clause adds supplementary information.
Defining clause
The bicycle that has the blue basket is mine.
The clause identifies which bicycle; removing it would change the reference.
Supplementary appositive
Ms Ortiz, our debate coach, reviewed the opening statement.
The name already identifies the person, so the appositive is enclosed by commas.
Common errors—and how to repair them
Incorrect: Our principal, Dr Cho will speak first.
Correct: Our principal, Dr Cho, will speak first.
A supplementary appositive needs a closing comma as well as an opening comma.
Incorrect: The files, that contain signatures, are locked.
Correct: The files that contain signatures are locked.
If only signed files are locked, the defining clause should not be set off.
Guided practice
Work through these with the hint first, then compare your reasoning.
-
Does the clause define or add information? “The route that avoids the tunnel is longer.”
Show a hint
Would “the route” alone identify the same one?
Check the answer
Answer: It defines the route.
Why: The clause identifies which route and takes no commas.
-
Punctuate: “The east wing which reopened in June contains the archive.”
Show a hint
Test whether the location remains identifiable without the clause.
Check the answer
Answer: The east wing, which reopened in June, contains the archive.
Why: East wing is already specific; the clause supplies supplementary information.
-
Identify the appositive: “Our neighbor, a marine biologist, found the shell.”
Show a hint
Which phrase could replace the noun beside it?
Check the answer
Answer: a marine biologist
Why: The noun phrase renames or explains our neighbor.
Independent practice
Answer without opening the key. The explanation is there for self-correction afterward.
-
Explain the difference: “My friends who live nearby walked over” and “My friends, who live nearby, walked over.”
Check the answer
Answer: The first selects nearby friends; the second says all the friends live nearby.
Why: Commas change the group included.
-
Punctuate: “My only sister Hana lives in Daegu.”
Check the answer
Answer: My only sister, Hana, lives in Daegu.
Why: Only sister already identifies the person, so Hana is supplementary.
-
Punctuate to select a subgroup: “Books which have torn covers go on this cart.”
Check the answer
Answer: Books that have torn covers go on this cart.
Why: The defining clause identifies which books; no commas are used.
-
Write a sentence with a supplementary relative clause.
Check the answer
Answer: Sample answer: The community center, which opened last year, offers free classes.
Why: The place is already identifiable and the clause adds information.
-
Why are paired commas required around an inserted nonessential phrase?
Check the answer
Answer: They mark both the entrance to and exit from the supplementary material.
Why: Omitting one boundary can make the sentence difficult to parse.
Exit ticket
Use these final checks to decide whether to continue or review the unit.
-
Explain the meaning difference: “The players who were injured rested” versus “The players, who were injured, rested.”
Check the answer
Answer: Without commas, only the injured players rested. With commas, the sentence presents all of the players as injured and says that all rested.
Why: This response applies the unit's central decision rule in context.
-
What question helps decide whether added noun information is defining?
Check the answer
Answer: Can the reader identify the same referent without it?
Why: If not, the information is defining and normally takes no commas.
-
Punctuate: “Professor Lee our guest speaker studies migration.”
Check the answer
Answer: Professor Lee, our guest speaker, studies migration.
Why: The name identifies the person; the appositive is supplementary.
Teacher notes and differentiation
- Use paired sentence comparisons to show that comma choice changes meaning, not merely breathing pauses.
- Invite learners to supply context before ruling whether a name is defining; family and title examples depend on what the audience already knows.
References consulted
- Appositives — Appositive definition and punctuation cross-check.
- Defining vs. Non-Defining — Relative-clause meaning and punctuation cross-check.
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Download the complete thirteen-unit student workbook or teacher guide, then add any of the original 250-question practice packets. Every unit also has its own printable teaching packet and answer key inside the lesson above.
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Spot It
145 questions: circle or underline the word doing the grammar job.
Choose It
60 questions: mark the best answer for each sentence or question.
Build It
15 questions: reorder word-bank parts and write each complete sentence.
Sort It
30 questions: write the correct grammar category beside each item.
The expanded curriculum adds 13 substantial teaching units and 143 guided, independent, and exit-ticket items; the original practice engine remains a separate 250-question bank across 15 skill nodes. CEFR and grade labels remain separate guidance lenses, not placement scores.
Curriculum sources, inspiration, and copyright approach
All KSSR questions, answer choices, examples, explanations, and interface text in this activity were originally produced by KSSR. Third-party books supplied for review informed the coverage audit only; their exercises, illustrations, page designs, and wording were not reproduced.
Works consulted — MLA-style bibliography
- Murphy, Raymond. English Grammar in Use: A Self-Study Reference and Practice Book for Intermediate Learners of English. 4th ed., Cambridge University Press, 2012.
- Grammar for Writing: Grade 6. Senior series consultant Beverly Ann Chin, William H. Sadlier, 2014.
- Writer's Choice: Grammar and Composition, Grade 6: Grammar Practice Workbook. Glencoe/McGraw-Hill, 2000.
- Glencoe Language Arts: Grammar and Language Workbook, Grade 9. Glencoe/McGraw-Hill, 1999.
Standards, internal references, and other consulted teaching resources
- Council of Europe — CEFR Companion Volume (2020) — CEFR range, grammatical-accuracy, and linguistic-range alignment.
- Common Core State Standards — English Language Arts: Language — K–12 Language-standard alignment.
- IXL — Adjectives and adverbs skill index — High-level inspiration for a grade-spanning skill progression; no IXL content or design reproduced.
- Purdue Online Writing Lab (Purdue OWL) — grammar, mechanics, and punctuation selections — Topic selection and grammatical-accuracy cross-check only; KSSR lesson prose, examples, and checkpoints are independently written and cite the specific Purdue OWL pages consulted.
- KSSR TOEFL / IELTS / SAT Grammar Reference and original practice quizzes — Internal coverage and academic-context reference.
- TPT Secondary Sara — Teaching Grammar Bundle: Punctuation; Tenses; Sentences; Direct and Indirect Speech; Active and Passive Voice; Verbals; and Pronouns teaching packs — Private coverage audit only; no pack wording, worksheets, posters, slides, or answer keys are republished.
- All Things Grammar classroom worksheets: Zero Conditional, Second Conditional, and Third Conditional — Coverage audit only; worksheet questions and layouts are not republished.
- Elementary Grammar teaching deck; Grammar Bites student slides; and owner-rendered KSSR grammar reference and quiz files — Private coverage and presentation audit only; third-party slide text and layouts are not republished.
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