Possessive 's and Whose: Tom's Car, Whose Is This?
Grammar Rule in 30 Seconds
Use 's to show who owns something and 'Whose' to ask about ownership.
- Add 's to a person: Tom's car.
- Use 's after the name: Sarah's book.
- Use 'Whose' for questions: Whose is this?
Possessive 's and Whose
Add 's after a noun to show ownership.
Structure: Owner + 's + thing
- Tom's car — the car belongs to Tom
- My sister's phone — the phone belongs to my sister
- The dog's bone — the bone belongs to the dog
Plural nouns (ending in -s): add only '
- The students' books
- My parents' house
Whose — asking about ownership
- Whose bag is this? — It's Maria's.
- Whose car is that? — It's my dad's.
⚠️ Tom's happy = Tom is happy | Tom's car = the car belongs to Tom
Possessive Formation
| Owner | Apostrophe | Possessive Form |
|---|---|---|
|
Tom
|
's
|
Tom's
|
|
Sarah
|
's
|
Sarah's
|
|
The dog
|
's
|
The dog's
|
|
My friend
|
's
|
My friend's
|
|
The boss
|
's
|
The boss's
|
|
The cat
|
's
|
The cat's
|
Possessive vs Contraction
| Form | Meaning | Example |
|---|---|---|
|
Whose
|
Possession
|
Whose bag?
|
|
Who's
|
Who is
|
Who's there?
|
Meanings
The possessive 's indicates that a person or entity owns or is associated with an object. 'Whose' is the interrogative form used to inquire about ownership.
Possession
Indicating ownership of an object.
“John's phone.”
“The cat's toy.”
Inquiry
Asking about the owner of an item.
“Whose bag is this?”
“Whose keys are those?”
Reference Table
| Form | Structure | Example |
|---|---|---|
|
Affirmative
|
Owner + 's + Object
|
It is Tom's car.
|
|
Negative
|
It is not + Owner + 's + Object
|
It is not Tom's car.
|
|
Question
|
Whose + Object + is + this?
|
Whose car is this?
|
|
Short Answer
|
It is + Owner's
|
It is Tom's.
|
|
Plural Owner
|
Owners' + Object
|
The students' books.
|
|
Irregular Plural
|
People's + Object
|
The people's choice.
|
Formality Spectrum
The vehicle belongs to Mr. Smith. (Describing a car)
This is Mr. Smith's car. (Describing a car)
That's Smithy's ride. (Describing a car)
That's his whip. (Describing a car)
Possession Map
People
- Tom's De Tom
Animals
- Cat's Del gato
Whose vs Who's
Decision Flow
Is it a question?
Possessive Types
Singular
- • Tom's
- • Sarah's
Plural
- • Students'
- • Teachers'
Examples by Level
This is Tom's car.
Whose is this?
It is Sarah's book.
Is this John's pen?
Whose phone is ringing?
My brother's dog is big.
Whose keys are these?
That is the teacher's desk.
Whose idea was this project?
The company's policy is clear.
I found someone's wallet.
Whose turn is it to drive?
The government's decision surprised everyone.
Whose responsibility is this task?
It is a matter of the artist's choice.
Whose perspective should we consider?
The nation's future depends on today's youth.
Whose narrative are we following?
The scientist's hypothesis was proven correct.
Whose authority is being challenged?
The poem's imagery evokes a sense of loss.
Whose legacy will endure the test of time?
The organization's structure is inherently hierarchical.
Whose interpretation of the law prevails?
Easily Confused
They sound identical.
Both use s.
Apostrophe placement.
Common Mistakes
Toms car
Tom's car
Whose is he?
Who is he?
The car of Tom
Tom's car
Who's book is this?
Whose book is this?
The dogs's bone
The dog's bone
Whose are these keys?
Whose keys are these?
It is my friends house
It is my friend's house
The childrens' toys
The children's toys
Whose the owner?
Who's the owner?
The house of my friend's
My friend's house
The boss' office
The boss's office
Whose to blame?
Who's to blame?
The company's' assets
The company's assets
Sentence Patterns
This is ___'s ___.
Whose ___ is this?
It is my ___'s ___.
The ___'s ___ is very ___.
Real World Usage
Check out my friend's new photo!
Whose turn is it?
I understand the company's goals.
Whose bag is this?
It's the customer's order.
Whose notebook is this?
Names ending in S
Whose vs Who's
Plurals
Inanimate objects
Smart Tips
Be consistent. Pick either 's or ' and stick to it.
Check if you mean 'who is'. If so, use Who's.
Remember the apostrophe goes after the s for plurals.
If it sounds awkward with 's, use 'of'.
Pronunciation
Sibilant endings
If the name ends in an 's' sound, add an 'iz' sound.
Question intonation
Whose bag is ↗this?
Rising pitch at the end for questions.
Memorize It
Mnemonic
Apostrophe S shows who owns the mess!
Visual Association
Imagine a tiny apostrophe acting like a hook, grabbing the object and pulling it toward the owner.
Rhyme
Add an apostrophe and an S, to show who owns the success.
Story
Tom lost his car keys. He asked, 'Whose keys are these?' Sarah said, 'They are Tom's keys.' Now Tom is happy.
Word Web
Challenge
Look at 5 items in your room and say out loud: 'This is [Name]'s [Item]'.
Cultural Notes
Americans use 's very frequently for almost everything.
British English often uses 'of' for inanimate objects more than Americans.
Australians often shorten names and add 's to them.
The 's is a remnant of the Old English genitive case ending -es.
Conversation Starters
Whose phone is that?
Whose turn is it to speak?
Whose opinion do you value most?
Whose legacy will be remembered?
Journal Prompts
Common Mistakes
Test Yourself
This is ___ (Tom) car.
___ is this bag?
Find and fix the mistake:
The dogs's bone is here.
The car of Sarah.
A: Whose keys are these? B: They are ___.
is / car / Tom's / this
Whose / Who's
Match each item on the left with its pair on the right:
Score: /8
Practice Exercises
8 exercisesThis is ___ (Tom) car.
___ is this bag?
Find and fix the mistake:
The dogs's bone is here.
The car of Sarah.
A: Whose keys are these? B: They are ___.
is / car / Tom's / this
Whose / Who's
Tom / Car
Score: /8
FAQ (8)
Mostly yes, but for inanimate objects, 'of' is often safer in formal writing.
You can add 's or just an apostrophe. Both are accepted.
No, you can use it for anything you are asking about.
It is a contraction of 'who is'. It has nothing to do with possession.
If the plural ends in s, just add an apostrophe: Students'.
Yes, 'Today's news' or 'Yesterday's meeting' are very common.
Yes, the core rule is universal across English-speaking countries.
Confusing 'Whose' and 'Who's'.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
de
English puts the owner first.
de
English uses a suffix.
Genitive case
German has more complex case endings.
no
English uses an apostrophe.
Idafa
English uses a clitic.
de
English is a suffix-based system.
