Отдам все баллы!!!!!!! Помогите решить! Там надо найти ошибку и написать правильно.

2. Mr Hill's brother are policemen.
3. Sally has never been to London.
4. Why are these girls wearing white blouses now?
5. Ask Peter about the film. He has seen it and can answer your questions.
6. Who works here? — Her parents do.
7. Have you ever been in Vladimir?
8. Who goes to school on Sunday?
9. We have seen the film.
10. He never sleeps in this room.