1. You needn't have done all this work.
2. John can't be the thief.
3. You needn't have carried all those parcels home yourself.
4. It can't have been Mrs. Mai you saw because she is in Boston.
5. John might be working this weekend.
6. I should have apologized.
7. I needn't have gone out after all.
8. You can't have locked the front door. Here is the key.
9. You shouldn't have left the windows open last night.
10. It must have been Alison who made the arrangement. I recognized her voice.
11. He couldn't possibly have known that his brother was seriously ill.
12. It must have been Judy that I saw in town this morning.

24. You needn’t have done all this work.

25. John can’t be the thief.

26. You needn’t have carried all those parcels home yourself.

27. It can’t have been Mrs. Mai you saw because she is in Boston.

28. John might be working this weekend.

29. I should have apologized.

30. I needn’t have gone out after all.

31. You can’t have locked the front door. Here is the key.

32. You shouldn’t have left the windows open last night.

33. It must have been Alison who made the arrangement. I recognized her voice.

34. He couldn’t possibly have known that his brother was seriously ill.

35. It must have been Judy that I saw in town this morning.