1. have eaten	11. have bought
2. has been	12. have used
3. has turned	13. has already seen
4. have always watched	14. has fixed
5. has given	15. has opened
6. has taught	16. have finished
7. has gone	17. have had
8. has started	18. have bloomed
9. has burned	19. has begun
10. hasn't arrived	20. has rung