Whose Is It?
Tom's car, the boys' room, the door of the house. The little apostrophe-s claims ownership — and knowing when to use of instead is half the game.
What are Possessives?
Four ways to say whose
English claims things with 's (people), with of (things), and with a bare apostrophe (groups). Same idea, four costumes.
's for people & animals
one owner → 'sTom's car · the dog's tail
s' for plural groups
many owners → apostrophe onlythe boys' room
of for things
the X of the Y — formal but safethe door of the house
's for time
time owns things tootoday's news · a week's holiday
⚠️ Live beings get 's; objects get of.
The Apostrophe Rules
Where the little hook goes
The apostrophe is a tiny letter but a big signal. One owner, many owners, or an irregular plural — the hook moves accordingly.
One owner: add 's
any singular noun
Tom's car · the cat's bowl
Many owners: add '
regular plurals already have -s
the boys' room · the students' books
Irregular plural: add 's
children, men, women have no -s
the children's toys · the men's team
Names ending in -s: 's
James, Charles — say it, then write it
James's house · Charles's bike
⚠️ The apostrophe goes where the owner goes: one owner, one apostrophe-s.
Common Mistakes
Five traps to escape
The apostrophe's favorite hiding spots: forgotten hooks, hooks in the wrong place, and of where 's belongs. Here is the escape.
This is my sisters bag.
This is my sister's bag.
💡 One owner → 's: sister's.
The childrens toys are here.
The children's toys are here.
💡 Irregular plural children has no -s → add 's.
The students's books are new.
The students' books are new.
💡 Students is already plural → apostrophe only, no extra s.
The cars of the men are red.
The men's cars are red.
💡 People take 's: the men's cars.
Today news is surprising.
Today's news is surprising.
💡 Time takes 's: today's news.
Quick Quiz
Test what you just learned
Three minutes, five questions — check what stuck. No essay questions, we promise.
This is my ___ bike.
💡 Extra info2 sections
's or of?
Who owns it decides the pattern
People and animals take 's; things take of. Match each pair — both forms mean the same, but only one sounds natural.
⚠️ Both are possible — the trick is what sounds natural. People: 's. Things: of.
Time with 's
Time owns things too
A day can own a plan, a year can own a holiday. Time expressions take 's like people do — one of the most surprising rules.