2.a.
1. No, Paul doesn't
2. Yes, they have.
3. No, she doesn't.
4. No, I don't.
5. Yes, they do.
2.b.
1. Has Jack got brown hair?
2. Have Mr. and Mrs. Smith got a daughter?
3. Has Susan got green eyes?
4. Has John's brother got a cat?
5. Has Jane got long hair?
3.
1. are
2. are
3. are
4. Isn't
5. aren't
6. are
7. isn't
8. are
9. isn't
10. am not