Personal pronouns are words like I, me, your, he, him and they. They belong to three classes: first person, second person and third person.
First person
The pronouns I, me, mine, we, us and ours are said to be in the first person because they stand for the person speaking.
I am a teacher.
John called me.
I have a daughter.
We have a house.
That car is ours.
This house is mine.
Second person
The pronouns you and yours are said to be in the second person because they stand for the person or persons spoken to.
You are a good girl.
Is this bag yours?
Third Person
The pronouns he, him, she, her, hers, they, theirs, them and it are said to be in the third person.
That phone is his.
They have visited our home several times, but I have never been to theirs.
Grammar notes:
The possessive has two forms – my, mine; our, ours; your, yours; her, hers; their, theirs. The forms my, our, your, her and their are not pronouns. They are adjectives used before a noun. The forms mine, ours, yours, hers and theirs are pronouns and can be used alone.
This is my car.
This car is mine.
That is her house.
That house is hers.
It is their fault.
The fault is theirs.