1. Play (present simple)
2. Am playing (present continuous)
3. Cleans (present simple)
4. Is cleaning (present continuous)
5. Are singing now (present continuous)
6. Sing (present simple)
7. Is reading (present continuous)
8. Is drinking (present continuous)
9. Are listening (present continuous)
10. Help (present simple)
11. Helps (present simple)
12. Is helping (present continuous)
13. Am helping (present continuous)
14. Make (present simple)
15. Are making (present continuous)
16. Ski (present simple)
17. Are skiing (present continuous)
18. Buys (present simple)
19. Is buying (present continuous)
20. Buy (present simple).