The possessive

the possessive

The possessive form is used with nouns referring to people, groups of people, countries, and animals. 'Belonging to' or 'ownership' is one of the relationships it expresses :

John owns a car. ('John' is the possessor or owner)
It is John's car.

America has some gold reserves. ('America' is the owner)
They are America's gold reserves.

It can also express other relationships, for example:

where someone works or studies or spends time:

John goes to this school. This is John's school.
John sleeps in this room. This is John's room.

a family relationship:

John's mother
The Queen's daughter

qualities:

John's patience.
The politician's hypocrisy.

Form

To form the possessive, add 's ('apostrophe -s') to the noun.
If the noun is plural, or already ends in -s, just add:' (an apostrophe).
For names ending in -s:
In speaking we add the sound /z/ to the name, but in writing it is possible to use either 's or just '. The 's form is more common. e.g. Thomas's book, James's shop.

Examples

The car of John = John's car.
The room of the girls = The girls' room.
Clothes for men = Men's clothes.
The sister of Charles = Charles' sister.
The boat of the sailors = The sailors' boat.

There are also some fixed expressions where the possessive form is used:

Time expressions	Other expressions
a day's work	For God's sake!
a fortnight's holiday	a pound's worth of apples.
a month's pay	the water's edge
today's newspaper	a stone's throw away (= very near)
in a year's time	at death's door (= very ill)
	in my mind's eye (= in my imagination)