Possessive pronouns

Possessive pronouns are pronouns used to refer to subjects in sentences that are specific person/people or thing/things belonging to a person/people [and sometimes to an animal(s) or thing(s)]. Possessive pronouns function as subjects, objects, and adjectives.

NumberPersonPossessive 
PronounSingular1stMy/Mine2ndYour/Yours3rdHis 
Her/Hers 
Its 
Plural1stOur/Ours2ndYour/Yours3rdTheir/Theirs
This category of possessive pronouns is a closed category. In other words, the ones listed are the complete set. No changes or additions exist.

Following are sentences that use possessive pronouns as subjects.

Singular

• Mine is the last cake on the table.
• Yours was left in the car.
• Hers came with the card attached.
• His was a mighty blow.

Plural

• Ours describe ways others might interpret art.
• Yours were the last to arrive.
• Theirs won first place.

Sentence examples using possessive pronouns as objects include.

• That backpack looks like mine.
• The restaurant’s bouillabaisse tastes similar to ours.

The following examples use possessive pronouns as adjectives.

• That is my seat in which you are sitting.
• Your seat is at the end of the row.

https://class.coursera.org/basicwriting-001/wiki/view?page=Week2Pronouns