1. she was busy. 2. I was not busy. 3. were you busy? 4. were they at home? 05. he wasn't at home. 6 I didn't know. 7. did they know? 8. she didn't know. 9. who knew? 10. nobody knew 11. did he read English books? 12. they never read. 13. had she a flat? 14. he had nothing 15. who was it?