POSSESSIVES

Rule	Examples
Singular Nouns :  (even if the meaning is plural  or if there are several words.)	Add 's after the possessor.	- Tom's car  - The cat's tail.  - The children's toys  - The Queen of England's jewels
Plural Nouns	Add 's after the plural 's'.	- My parents' car.  - The students' rooms.  - My grandparents' house
Names/nouns ending in 's'	Add 's after the last 's'.	- Denis's wife  - Gladys's job  - The boss's office.
Double Possessive	Add 's after the possessor's name, or use a possessive pronoun.	- A friend of my father's    (one of his friends, not the only one.)  - A friend of mine/    his/hers/ours/yours/theirs.  - A friend of Julie's
Shops and people's homes	Often take the possessive.	- At the hairdresser's  - At the dentist's  - At the Brown's
N.B. The apostrophe followed by s ('s) (ex:Tom's), to denote possession, is used for living things. living things (humans and animals) : John's car, the cat's milk, the dog's tail  (not the car's door) groups and institutions : The government's proposal, the company's policy. BUT : the door of the car the leg of the table. the roof of the house.