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