Be careful!
- Possessive pronouns do not have an apostrophe:
Is that car yours/hers/ours/theirs?
(Is that car your's/her's/our's/their's?)
We can use a possessive pronoun instead of a full noun phrase to avoid repeating words:
Is that John's car?
No, it's mine. (INSTEAD OF No, it's [my car].)
Whose coat is this?
Is it yours? (INSTEAD OF Is it [your coat]?)