11. That can't have been/shouldn't have been Nick that you saw.
12. You must have given/might have given me a hand!
13. I caught a later train because I had to see/must have seen a client.
14. I suppose Bill should have lost/might have lost his way.
15. I didn't refuse the cake, as it should have been/would have been rude.
16. I don't know who rang, but it could have been/must have been Jim.
17. It was odd that you should have bought/would have bought the same car.
18. It's a pity you didn't ask because I can't help/could have helped you.
19. It's your own fault, you can't have/shouldn't have gone to bed so late.
11. That can't have been/shouldn't have been Nick that you saw.
12. You must have given/might have given me a hand!
13. I caught a later train because I had to see/must have seen a client.
14. I suppose Bill should have lost/might have lost his way.
15. I didn't refuse the cake, as it should have been/would have been rude.
16. I don't know who rang, but it could have been/must have been Jim.
17. It was odd that you should have bought/would have bought the same car.
18. It's a pity you didn't ask because I can't help/could have helped you.
19. It's your own fault, you can't have/shouldn't have gone to bed so late