I/
Personal pronoun: I, you, we, they, he, she, it
Object pronoun: me, you, us, them, him, her
Possessive adjective: my, your, our, their, his, her, its
Possessive pronoun: mine, yours, ours, theirs, his, hers, its
II/
1. My
2. He - his
3. Her
4. you - I - it
5. her - She
6. I - him - his
7. it
8. My - her
9. You - your
10. My - It - they - it
III/
1. Their house and ours are on the same street.
2. Those jeans are mine.
3. The dictionary is Paul's.
4. The black car is my mother's.
5. Is this my dictionary or yours?
IV/
1. I used to dislike classical music.
2. Dennis used to smoke three years ago.
3. My parents used to live in the USA when they were young.
4. Jim used to be my best friend, but we aren't friends any more.