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An apostrophe is used:

EXAMPLE: '86 =1986
EXAMPLE: I am = I'm / we are = we're / he will = he'll / they would = they'd /do not = don't/I have = I've.

 

Add 's to a single noun or name: uncle's pipe; George's girlfriend; dog's tail; Thomas's car.
Add 's to singular noun that end in –s: actress's role; princess's lover; rhinoceros's skin.
Add 's to plural nouns that end in –s: boys' bicycles; friends' houses; books' covers
Add 's to other plural nouns: children's toys; women's clothes; men's boots.
Add 's to a person's office or shop: I'll buy the pork at the butcher's. / I'll be visiting Tom's.
Add 's only after the second name: Jack and Jill's pail; Bonnie and Clyde's loot.