1. am writing
2. was writing
3. is sleeping
4. was sleeping
5. are not doing - are playing
6. weren't doing - were playing
7. was reading
8. is not reading
9. is going
10. are you doing - am drinking
11. were you drinking - wasn't drinking - was eating
12. was reading , is reading
13. is playing
14. was shining, were singing
15. are you eating
16. were you eating
17. is your father doing
18. were your father doing
19. is she crying
20. was she crying
21. am enjoying