Possessive Pronouns
Here are the possessive pronouns in English:
1st person, singular -- mine
3rd person, singular -- his, hers, its
1st person, plural -- ours
2nd person, sing./pl. -- yours
3rd person, plural -- theirs

In English, the gender and number of the possessor determines the form of the possessive pronoun:
--I have a bicycle. It's mine.
--They have some bread. It's theirs.

NOTE: Often the subject of the verb is not the person who owns the noun. Be careful about this. You must know the gender and number of the owner to be able to use possessive pronouns correctly:
--Are you driving his car or hers?
--We're driving hers.