1. Has she got a cat? Yes, she has. It's her cat. It's hers.
2. Have they got hats? Yes, they have. They are their hats. They are theirs.
3. Has he got a car? Yes, he has. It's his car. It's his.
4. Have you got a guitar? Yes, I have. It's my guitar. It's mine.
5. Has she got a ballon? Yes, she has. It's her balloon. It's hers.