1. are playing
2. isn't working, is cooking
3. are talking
4. are going
5. am not drinking, I am drinking
6. is sleeping
7. Are you eating, am having
8. What is your sister doing, is washing
9. are not eating, are eating
10. Are you learning, am learning
11. is smoking
12. We are still writing
13. What are you reading, am reading
14. is playing
15. are swimming
16. is knocking