Key to Exercise

1. can/could/can't (couldn't)

2. will be able to

3. Won't be able to

4. can't (couldn't)/can't (couldn't)

5. will be able to

6. will be able to

7. couldn't/can't

8. will be able to

9. won't be able to

10. could/couldn't

11. can/can/can't

12. can't/can't (couldn't)/can't (couldn't)

13. could/was able to

14. was able to

15. could (was able to)/could (was able to)

16. was able to

17. could/was able to

18. could/was able to

19. was able to

20. was able to

21. could/was able to

22. was able to

23. was able to

24. was able to

25. can (could)/could

26. could/couldn't

27. could/couldn't/can't

28. could

29. couldn't (wouldn't be able to)

30. couldn't (wouldn't be able to)

31. could (can)/can't

32. could/could

33. can (could)/couldn't (can't)

34. couldn't (wouldn't be able to

35. couldn't (wasn't able to)/couldn't (wasn't able to)

36. could