1. are used

2. be kept

3. were kept

4. kept

5. were lost

6. lost

7. sign

8. be signed

9. was signed

10. signed

11. was signing

12. hasn't sign

13. water

14. watered

15. were watered

16. was watering

17. haven't watered

18. be watered

19. finished, watered

20. am watering, didn't water