16.I don’t read books in the morning.
17. I’m writing an exercise now.
18. I’m not writing a letter now.
19. They aren’t playing in the yard now.
20. They aren’t playing in the street now.
21. Are they playing in the room now?
22. He helps his mother every day.
23. Does he help his mother every day?
24. He doesn’t help his mother every day.
25. Do you go to school on Sunday?
26. Is she working in the shop now?