1. Have you ever bought a piano?
2. When did you buy a piano?
3. Have you ever been to London?
4. When were you in London?
5. Have you ever spoken to a pillot?
6. When did you speak to the pilot?
7. Have you ever seen the film?
8. When did you see the film?
9. Have you ever met Mr. Carter?
10. When did you meet him?