PSLE English: Whose or Who’s?

PSLE Learner’s Guide · Vol 0477 · Possession, contraction and clause expansion

Find the exact decision this guide helps you make

This guide helps a Primary 6 learner choose who’s only when who is or who has fits grammatically, and use whose to ask about or identify ownership, association or connection. The short rule is expand who’s to who is or who has; use whose for belonging, association or identification. You will learn the mechanism, see worked examples, repair common misconceptions, practise in stages and use a compact examination routine.

This is an examination-performance guide, not a replacement for full topic teaching. Use the PSLE Learning Guide for the wider sequence and the English Learning Hub for deeper subject instruction.

For complete teaching and topic progression, continue through the English Learning Hub. The English Learning Hub grammar, punctuation and editing routes is the canonical route for deeper coverage. This volume keeps a narrower examination-performance job. Use the complete PSLE Learner’s Guide volume directory as the permanent series route. For a nearby published routine, continue to Vol 0473 on using expansion and meaning to decide between familiar sound-alike forms.

A careful note about the current examination year

This article is written for the 2026 PSLE preparation context. SEAB’s official 2026 formats page lists English Language as subject 0001, revised Mathematics as 0008 and revised Science as 0009. Format details can change, so confirm any paper-specific timing, component or administrative instruction with the current official SEAB 2026 source and your school. The reasoning routine taught here is deliberately broader: it strengthens how you read evidence, make a decision and check an answer.

Why this mistake happens

Whose and who’s sound identical, so sound cannot settle the spelling. Who’s is a contraction and must expand to who is or who has. Whose is a possessive or identifying word: whose bag, whose idea or the pupil whose answer was selected. The apostrophe in who’s marks missing letters; it does not mark possession. Expansion therefore gives a fast, reliable check.

The mind likes a fast label. A familiar word, operation, result or rule triggers an answer before the conditions have been checked. That shortcut sometimes works in easy practice, so it becomes a habit. In a demanding question, however, a nearby distractor preserves the surface pattern while changing one important condition. The learner then performs a correct-looking move on the wrong object. The repair is to slow only the decision point: identify what is being linked or measured, preserve its labels, test the conditions, and then continue at normal speed.

Think of the method as a chain with four locks. Object: what exact idea or quantity is under discussion? Relationship: how are the relevant parts connected? Condition: what must be true for the move to be valid? Claim: what is the strongest conclusion the evidence actually supports? A weak answer often skips from object to claim. A strong answer makes the two middle locks visible.

The one-line operating rule

Expand who’s to who is or who has; use whose for belonging, association or identification. Say it before the first practice set. During timed work, shorten it to four cue words you can recall without stopping.

The step-by-step method

Step 1: Locate the form and read the complete clause

Locate the form and read the complete clause. Do this on the page, not only in your head. A brief arrow, label, unit, underline or condition note makes the decision inspectable. If you later find an error, you can repair the exact step instead of restarting the entire answer.

At this stage, do not decorate the answer with extra facts. Ask one diagnostic question: “What evidence would make this step wrong?” If you can name a possible failure, check it now. If the failure is absent, continue. This negative check prevents confidence from replacing proof.

Step 2: Replace the form with who is and test grammar and meaning

Replace the form with who is and test grammar and meaning. Do this on the page, not only in your head. A brief arrow, label, unit, underline or condition note makes the decision inspectable. If you later find an error, you can repair the exact step instead of restarting the entire answer.

Step 3: If that fails, replace it with who has

If that fails, replace it with who has. Do this on the page, not only in your head. A brief arrow, label, unit, underline or condition note makes the decision inspectable. If you later find an error, you can repair the exact step instead of restarting the entire answer.

Step 4: Use who’s only when one expansion works exactly

Use who’s only when one expansion works exactly. Do this on the page, not only in your head. A brief arrow, label, unit, underline or condition note makes the decision inspectable. If you later find an error, you can repair the exact step instead of restarting the entire answer.

Step 5: Otherwise ask whether the sentence identifies an owner, associated person or linked noun

Otherwise ask whether the sentence identifies an owner, associated person or linked noun. Do this on the page, not only in your head. A brief arrow, label, unit, underline or condition note makes the decision inspectable. If you later find an error, you can repair the exact step instead of restarting the entire answer.

Step 6: Use whose for that possessive or relative job, then reread the full sentence

Use whose for that possessive or relative job, then reread the full sentence. Do this on the page, not only in your head. A brief arrow, label, unit, underline or condition note makes the decision inspectable. If you later find an error, you can repair the exact step instead of restarting the entire answer.

Misconceptions to diagnose and repair

Misconception 1

Tempting move: Adding an apostrophe because possession is involved. This feels efficient because it removes a decision. It is unsafe because the question may have changed the reference, unit, interval, definition or strength of claim.

Repair: return to the line, number, setup or statement that supplies the condition. Mark it with a short label. Then rebuild only the affected link. Keep all earlier work that remains valid. The purpose of checking is targeted correction, not anxious repetition.

Misconception 2

Tempting move: Using whose whenever the next word is a noun without checking the clause. This feels efficient because it removes a decision. It is unsafe because the question may have changed the reference, unit, interval, definition or strength of claim.

Misconception 3

Tempting move: Expanding who’s to who was or who will. This feels efficient because it removes a decision. It is unsafe because the question may have changed the reference, unit, interval, definition or strength of claim.

Misconception 4

Tempting move: Forgetting that who has works only when has is an auxiliary or possession verb in context. This feels efficient because it removes a decision. It is unsafe because the question may have changed the reference, unit, interval, definition or strength of claim.

Misconception 5

Tempting move: Assuming whose can refer only to people in every style and context. This feels efficient because it removes a decision. It is unsafe because the question may have changed the reference, unit, interval, definition or strength of claim.

Eight worked cases

Worked case 1: Owner question

Scenario. ___ pencil is on the floor?

The tempting error. Writing who’s because the pencil belongs to someone. The response may contain relevant knowledge, yet it does not answer the precise decision because one label or condition has been lost.

Work the mechanism. The sentence asks which person owns or is associated with the pencil. Who is pencil is impossible. Write the decisive evidence beside the step where it is used. This makes the reasoning readable to another person and prevents a later sentence from quietly changing the meaning.

Answer form. Use Whose pencil. Notice that the answer carries both the conclusion and the reason that licenses it. It is complete without becoming a list of everything you know.

Check. Re-read the command word, substitute the conclusion into the original situation and ask whether every noun, number and comparison still has the same referent or unit. If the answer is stronger than the evidence, narrow it.

Delayed transfer. Answer with a possessive noun. Do this variation after a gap, not immediately, so retrieval rather than imitation drives the solution.

Worked case 2: Identity

Scenario. ___ at the door?

The tempting error. Writing whose because the question asks which person. The response may contain relevant knowledge, yet it does not answer the precise decision because one label or condition has been lost.

Work the mechanism. Who is at the door is a complete expansion. Write the decisive evidence beside the step where it is used. This makes the reasoning readable to another person and prevents a later sentence from quietly changing the meaning.

Answer form. Use Who’s at the door? Notice that the answer carries both the conclusion and the reason that licenses it. It is complete without becoming a list of everything you know.

Delayed transfer. Write the uncontracted version. Do this variation after a gap, not immediately, so retrieval rather than imitation drives the solution.

Worked case 3: Present perfect

Scenario. ___ finished the first section?

The tempting error. Choosing whose before the past participle. The response may contain relevant knowledge, yet it does not answer the precise decision because one label or condition has been lost.

Work the mechanism. Who has finished is grammatical; has helps form the present perfect. Write the decisive evidence beside the step where it is used. This makes the reasoning readable to another person and prevents a later sentence from quietly changing the meaning.

Answer form. Use Who’s finished. Notice that the answer carries both the conclusion and the reason that licenses it. It is complete without becoming a list of everything you know.

Delayed transfer. Expand before punctuating. Do this variation after a gap, not immediately, so retrieval rather than imitation drives the solution.

Worked case 4: Relative possession

Scenario. The player ___ racket broke borrowed another.

The tempting error. Using who’s because the player is introduced. The response may contain relevant knowledge, yet it does not answer the precise decision because one label or condition has been lost.

Work the mechanism. The clause links the player to the racket. Who is racket and who has racket do not fit this structure. Write the decisive evidence beside the step where it is used. This makes the reasoning readable to another person and prevents a later sentence from quietly changing the meaning.

Answer form. Use whose racket broke. Notice that the answer carries both the conclusion and the reason that licenses it. It is complete without becoming a list of everything you know.

Delayed transfer. Identify the noun owned. Do this variation after a gap, not immediately, so retrieval rather than imitation drives the solution.

Worked case 5: Who has possession

Scenario. ___ the key now?

The tempting error. Assuming who has must always be contracted. The response may contain relevant knowledge, yet it does not answer the precise decision because one label or condition has been lost.

Work the mechanism. Who has the key can mean possession, and Who’s the key is not the same sentence because contraction before a direct noun may sound unnatural or ambiguous. In careful exam writing, retain Who has when clarity matters. Write the decisive evidence beside the step where it is used. This makes the reasoning readable to another person and prevents a later sentence from quietly changing the meaning.

Answer form. Use Who has the key now? Notice that the answer carries both the conclusion and the reason that licenses it. It is complete without becoming a list of everything you know.

Delayed transfer. Contrast with Who’s got the key? Do this variation after a gap, not immediately, so retrieval rather than imitation drives the solution.

Worked case 6: Both forms

Scenario. Do you know ___ jacket this is and ___ wearing it?

The tempting error. Using one spelling twice. The response may contain relevant knowledge, yet it does not answer the precise decision because one label or condition has been lost.

Work the mechanism. The first asks ownership; the second expands to who is wearing it. Write the decisive evidence beside the step where it is used. This makes the reasoning readable to another person and prevents a later sentence from quietly changing the meaning.

Answer form. Write whose jacket and who’s wearing it. Notice that the answer carries both the conclusion and the reason that licenses it. It is complete without becoming a list of everything you know.

Delayed transfer. Apply both tests. Do this variation after a gap, not immediately, so retrieval rather than imitation drives the solution.

Worked case 7: No noun after whose

Scenario. I found the umbrella, but I do not know whose it is.

The tempting error. Rejecting whose because no noun immediately follows. The response may contain relevant knowledge, yet it does not answer the precise decision because one label or condition has been lost.

Work the mechanism. Whose can stand as a pronoun when the owned item is already clear. Write the decisive evidence beside the step where it is used. This makes the reasoning readable to another person and prevents a later sentence from quietly changing the meaning.

Answer form. Keep whose. Notice that the answer carries both the conclusion and the reason that licenses it. It is complete without becoming a list of everything you know.

Delayed transfer. Supply the omitted noun mentally. Do this variation after a gap, not immediately, so retrieval rather than imitation drives the solution.

Worked case 8: Editing pair

Scenario. Who’s notebook was returned to the pupil whose absent?

The tempting error. Keeping both because each sounds correct. The response may contain relevant knowledge, yet it does not answer the precise decision because one label or condition has been lost.

Work the mechanism. The first needs ownership; the second needs who is absent. Write the decisive evidence beside the step where it is used. This makes the reasoning readable to another person and prevents a later sentence from quietly changing the meaning.

Answer form. Whose notebook was returned to the pupil who’s absent? Notice that the answer carries both the conclusion and the reason that licenses it. It is complete without becoming a list of everything you know.

Delayed transfer. Expand the contraction. Do this variation after a gap, not immediately, so retrieval rather than imitation drives the solution.

Practice progression: from recognition to transfer

Round 1: mark only

Use six short items. Do not answer them. Mark the object, reference, unit, interval, condition or rule that controls the decision. The goal is accurate noticing without the burden of full writing.

Record the result as one of four codes: N for noticing error, M for method error, I for interpretation error, and C for checking error. Practise the weakest code with a fresh item. Do not repeat an entire worksheet when only one decision needs repair.

Round 2: explain the choice

Solve four items and add one sentence beginning “This is valid because…”. If the sentence merely repeats the answer, the condition is still hidden.

Round 3: repair a wrong answer

Take four plausible wrong answers. Identify the earliest faulty link, preserve the correct work and rewrite only what must change. This develops error diagnosis rather than answer copying.

Round 4: mixed questions

Mix this job with two older skills. Remove headings that reveal the topic. Decide which routine applies before solving. Selection is part of performance.

Round 5: timed set

Use a small timed set with a fixed check budget. Mark a cue at the decision point, finish the answer, then perform one positive check and one rejection check.

Round 6: delayed transfer

Return after two or three days with different surface details. Before seeing notes, write the one-line rule from memory and solve. Compare the new error pattern with the earlier one.

A compact practice log

Question source and date
Decision cue you marked
Your first answer in one line
Earliest wrong link, if any
Corrected rule in twelve words or fewer
Date for delayed transfer
Whether the new item was solved without notes

A useful log is small enough to maintain. It should help you predict the next mistake, not become a scrapbook of completed pages.

Graded independent practice with explained answers

Practice item 1: Possession

Prompt. Complete: “___ bicycle is outside?”

Answer. Whose

Why. The question asks ownership.

Check or extension. Try who is.

Practice item 2: Identity

Prompt. Complete: “___ leading the group?”

Answer. Who’s

Why. It expands to who is.

Check or extension. Write the full form.

Practice item 3: Present perfect

Prompt. Complete: “___ seen the notice?”

Answer. Who’s

Why. It expands to who has.

Check or extension. Name the tense.

Practice item 4: Repair

Prompt. Repair: “Who’s idea solved the problem?”

Answer. Whose idea solved the problem?

Why. The idea is associated with an owner.

Check or extension. Explain the apostrophe.

Practice item 5: Pronoun

Prompt. Complete: “I know which bag is mine, but not ___ that one is.”

Answer. whose

Why. The owned noun is understood.

Check or extension. Restore whose bag mentally.

Practice item 6: Delayed transfer

Prompt. After two days, state the expansion test.

Answer. Use who’s only when who is or who has fits; otherwise use whose for possession or association.

Why. Expansion reveals the contraction.

Check or extension. Create one sentence with both.

Checking that tests meaning, not neatness

A check should have a target. First run a positive test: identify the evidence, calculation or condition that supports your answer. Then run a rejection test: name the closest tempting alternative and the exact reason it fails. This pair is more powerful than rereading the same line while hoping to feel certain.

Use a reverse check where possible. Reconstruct the original amount, replace a connector with its expanded meaning, map a conclusion back to the data, or apply the repaired rule to the apparent exception. Reverse checking exposes lost labels and unsupported leaps because the answer has to return to its source.

Stop when the check has answered a real question. Repeatedly changing a sound answer because it feels unfamiliar is not checking. If the object, relationship, condition and claim all remain consistent, keep the answer and move on.

Examination control

When time is tight, use the cue ORCC: Object, Relationship, Condition, Claim. Write only the smallest useful mark—an arrow, a unit, a time interval, a boundary or a qualifying word. The mark should prevent the known error without slowing the rest of the paper.

Read the command word and identify the decision.
Mark the object or quantity that must keep its identity.
State the relationship or operation in plain language.
Check the condition that makes it valid.
Give the claim at the strength supported by evidence.
Use one positive and one rejection check, then stop.

If you become stuck, do not produce a longer answer immediately. Shorten the task: write what is known, what must be decided and what condition separates the two best options. A precise partial structure often unlocks the next step and also makes any partial credit more defensible.

A seven-day delayed-transfer plan

Day 1: learn the one-line rule and complete two worked cases with notes.
Day 2: solve four short items without notes; classify errors by N, M, I or C.
Day 3: mix two new items with two older PSLE skills and hide the topic labels.
Day 4: explain one case aloud to a parent, tutor or imaginary learner in under two minutes.
Day 5: complete a timed mini-set and use the ORCC marks only at decision points.
Day 6: rest this skill or practise a different subject so memory has to consolidate.
Day 7: attempt one unfamiliar transfer item, then write the smallest rule revision needed.

Success on Day 7 matters more than fluency immediately after reading. Delayed transfer shows whether you can retrieve the method, recognise its job under new surface details and control it without a model beside you.

Guidance for parents and tutors

Ask for the decision, not a performance speech. Useful prompts are: “What exactly are you deciding?”, “Which word, unit or condition controls it?”, “What is the closest wrong option?” and “How can you check without starting again?” These questions keep ownership with the learner while making thinking visible.

When an error occurs, locate its earliest point. Praise accurate diagnosis even before the final answer is corrected. If the learner repeatedly loses the same label, introduce one stable notation: arrows for reference, units beside remainders, interval brackets for rates, or boxes around claim conditions. Avoid adding several new routines at once.

Build variation gradually. Begin with clean examples, then add one plausible distractor, then mix the skill with older content, and finally delay the next attempt. A learner who succeeds only when the worksheet title names the method has learned recognition, not transfer.

Keep emotional temperature low. A surprising exception or remainder is information, not proof that the learner is “bad at” a subject. The practical question is which link changed. Once that link is named, practise a small set that isolates it and then return to mixed questions.

The independent-reader test

Before you call the skill secure, explain one solution to a reader who cannot see your thoughts. Name the starting information, the decision, the condition that controls it and the reason the rejected alternative fails. If the explanation depends on “you know what I mean”, a label is still missing. Add that label to the answer, then remove any sentence that does not help the reader follow the chain.

Next, cover the worked example and rebuild the method from a fresh prompt. Do not copy the surface details. Recover the sequence of decisions. This separates genuine control from familiarity with one page. A learner who can transfer the decision routine to new names, numbers or apparatus has a more dependable examination skill than a learner who can reproduce only the model answer.

Finally, compress the method without losing its safety condition. Write one sentence of no more than fifteen words, then test that sentence against an awkward case. If the short rule gives the wrong result, restore the missing condition. Good compression keeps the mechanism available under time pressure while the awkward case prevents the cue from becoming a careless shortcut.

A timed diagnosis drill

Set aside twelve minutes and choose three unfamiliar questions that could trigger this error. Spend the first minute identifying the decision in each question without solving it. Mark the object, relationship, condition and permitted claim. This preview is not wasted time: it prevents you from entering a long method before you know what the method must preserve.

Solve the three questions in the next eight minutes. After each answer, write one tiny prediction about what a correct answer should preserve: a reference word, a whole-number boundary, a pathway, a unit, a direction or an observable result. Then compare the finished answer with that prediction. If they disagree, repair the earliest link and keep the later work only when its meaning remains valid.

Use the final three minutes to classify the errors. A noticing error means the controlling detail was never marked. A method error means the right information was present but the wrong operation or reasoning chain was used. An interpretation error means the result was calculated or observed correctly but described at the wrong level. A checking error means the answer contained a detectable contradiction that the final audit missed.

Repeat the drill a week later with different surface details and without looking at the old corrections. Improvement is not merely a higher score. Look for a shorter pause at the decision point, fewer unnecessary restarts, more stable labels and a clearer reason for rejecting the nearest wrong answer. Those are signs that the performance routine is becoming portable.

Frequently asked questions

Does an apostrophe show possession in who’s?

No. In who’s it marks omitted letters from who is or who has.

Can whose stand without a following noun?

Yes when the noun is already understood.

Can who’s mean who was?

No. It represents who is or who has.

Why does sound not help?

The two forms are homophones.

Is Who’s got acceptable?

It can be, but formal exam writing should choose the clearest grammatical form for the sentence.

What is the fastest check?

Expand the contraction fully.

Can whose introduce a relative clause?

Yes: the learner whose book was found.

What should I study next?

Use the English Learning Hub for apostrophes, contractions and relative clauses.

Your next route

Use this guide until you can state the rule, solve an unfamiliar case and explain why the closest alternative fails. Then move to a deeper subject route: the English Learning Hub, Mathematics Learning Hub, Science Learning Hub, or the full learning-hubs directory. Return to the PSLE Learning Guide when you want to place this skill inside a broader revision sequence.

The English guide opens the batch by making an apostrophe answer to expansion rather than possession.

How to Perform in PSLE | Learner’s Guide Vol 0477 | English: Choose Whose or Who’s by Expanding Who Is and Who Has