1. I read
2. I don't read
3. I am writing
4. I'm not writing
5. They are playing
6. They aren't playing
7. Are they playing?
8. He helps
9. Does he help?
10. doesn't help
11. Do you go?
12. My friend doesn't like
13. I'm not reading
14. Is he sleeping now?
15. We don't go
16. My sister eats
17. She isn't eating
18. They do
19. They don't go
20. My father doesn't work
21. He works