Possessives tell us ‘this belongs to this thing’.

Possessive Determiners
(also called ‘possessive adjectives’)

The English pronouns include:

I
You
He
She
It
We
They
Some
Many

The possessive forms of these are:

My (I)
Your (You)
His (He)
Her (She)
Its (It)
Our (We)
Their (They)

‘Many’ and ‘some’ do not generally have possessive forms (they must use a noun – although sometimes people are lazy and make one).

Examples

My hat is blue.
Your hat is yellow.
His hat is red.
Her hat is ugly.
Its ears are big.
Our house is old.
Their house is new.

Some dogs’s owners look like their dogs.
Many people’s ideas are stupid.

Adding ‘s

‘s is used for simple, single nouns:

The restaurant’s food is excellent.
The car’s battery is dead.
The cat’s breath smells terrible.
Ross’s father is a police officer.

Adding s’

s’ is used for common plurals (plurals that use s)

The cat’s head is big. (one cat)
The cats’ heads are big. (more than one cat)

My fox’s tail is long. (one fox)
The foxes’ tails are long. (more than one fox)

The bush’s leaves are green. (one bush)
The bushes’ leaves are green. (more than one bush)

Possessive pronouns

In the SVO pattern, possessive pronouns are used for the object (O).

The possessive pronouns are:

mine (used for ‘I’)
yours (you)
his (he)
hers (she)
its (it)
ours (we)
theirs (they)

Examples using possessive pronouns

The bag is mine.
The book is yours.
These boxes are his.
Those shoes are hers.
That burger is ours.
This plate is theirs.