1. She is busy
2. I'm not busy
3. Are you busy?
4. Are they at home?
5. He isn't at home.
6. I don't know
6. Do they know?
7. She doesn't know
8. Who knows?
9. No one knows
10. He reads English books?
11. They never read
12. Does she have a flat?
13. He doesn't have anything
14. Who is it?