Question

I. Fill in the spaces in the following sentences with one auxiliary + perfect infinitive
( must, can’t, might, may, need, should….. + have PII)
1. Did you hear me come in last night. – No, I (sleep) ................... ...................
2. You (help) ................... ................... him. (You helped him but he didn’t need
help).
3. I wonder who broke the wineglass; it (be) ................... ................... the cat for she
was out all day.
4. He is back already. – He (start) ................... ................... very early.
5. I told him to turn left and he immediately turned right. – He (understand)
................... you.
6. The door was open.
- It (be) ................... ................... open. I had locked it myself and the key was in
my pocket.
7. I’ve opened another bottle.
- You (do) ................... ................... that. We've just only started this one.
8. I saw Ann in the library yesterday. You (see) ................... ................... her; she’s
still abroad.
9. I’ve made two copies. You (make) ................... ................... two. One would have
been enough.
10. I had to get down the mountain in a thick fog. – That (be) ...................
................... difficult.
11. We’ve sent for a doctor. – You (send) ................... ................... for him. I’m
perfectly well.
12. He (walk) ................... ................... from here to London in two hours. It isn’t
possible.
13. I had my umbrella when I came out but I haven’t got now. – You (leave)
................... ................... on the bus.
14. Why didn’t you wait for me yesterday? – I waited five minutes. – You (wait)
................... ................... a little longer.
15. Perhaps he swam across. – No, he (do) ................... ................... that; he can’t
swim.

16. We went to a restaurant and had a very good dinner for $3.
- You (have) ................... ................... a very good dinner if you only paid $3.
17. That carpet was entirely made by hand. – It (take) ................... ................... a long
time.
18. The machine said “you weigh 63 kg,” and I said “Thank you.”
- You (say) ................... ................... anything.
19. I have just watered the roses.
– You (water) ................... ................... them. Look, it’s raining now.
20. A: I have finished.
B: But you were only half way through when I went to bed. You (work)
................... ................... all night.
21. A: I’ve written to Paul.
B: You (write) ................... ................... to him. He’s coming here tomorrow.
You’ll see him before he gets your letter.
22. I left my bicycle here, and now it’s gone. – Someone (borrow) ...................
................... it.

Answer 1

1. Did you hear me come in last night? – No, I must have been sleeping.
2. You helped him. (You helped him but he didn’t need help).
3. I wonder who broke the wineglass; it may have been the cat, for she was out all day.
4. He is back already. – He must have started very early.
5. I told him to turn left and he immediately turned right. – He may not have understood you.
6. The door was open.
- It must have been left open. I had locked it myself, and the key was in my pocket.
7. I’ve opened another bottle.
- You shouldn’t have done that. We've just only started this one.
8. I saw Ann in the library yesterday. You may not have seen her; she’s still abroad.
9. I’ve made two copies. You needn’t have made two. One would have been enough.
10. I had to get down the mountain in thick fog. – That must have been difficult.
11. We’ve sent for a doctor. – You needn’t have sent for him. I’m perfectly well.
12. He couldn’t have walked from here to London in two hours. It isn’t possible.
13. I had my umbrella when I came out, but I haven’t got it now. – You must have left it on the bus.
14. Why didn’t you wait for me yesterday? – I waited five minutes. – You should have waited a little longer.
15. Perhaps he swam across. – No, he can’t have done that; he can’t swim.

16. You would have a very good dinner if you only paid 3.
17. That carpet was entirely made by hand. – It must have taken a long time.
18. The machine said “You weigh 63 kg,” and I said, “Thank you.”
- You didn’t say anything.
19. I have just watered the roses.
– You needn’t have watered them. Look, it’s raining now.
20. A: I have finished.
B: But you were only halfway through when I went to bed. You must have worked all night.
21. A: I’ve written to Paul.
B: You needn’t have written to him. He’s coming here tomorrow. You’ll see him before he gets your letter.
22. I left my bicycle here, and now it’s gone. – Someone must have borrowed it.

Answer 2

I. Fill in the spaces in the following sentences with one auxiliary + perfect infinitive
( must, can’t, might, may, need, should….. + have PII)
1. Did you hear me come in last night. – No, I (sleep) .....must have slept.............. ...................
2. You (help) .............needn't have helped...... ................... him. (You helped him but he didn’t need
help).
3. I wonder who broke the wineglass; it (be) .......can't have been........... ................... the cat for she
was out all day.
4. He is back already. – He (start) ........must have started........... ................... very early.
5. I told him to turn left and he immediately turned right. – He (understand)
..........mustn't have understood......... you.
6. The door was open.
- It (be) ....mustn't have been............... ................... open. I had locked it myself and the key was in
my pocket.
7. I’ve opened another bottle.
- You (do) ......shouldn't have done............. ................... that. We've just only started this one.
8. I saw Ann in the library yesterday. You (see) ........can't have seen........... ................... her; she’s
still abroad.
9. I’ve made two copies. You (make) ..needn't have made................. ................... two. One would have
been enough.
10. I had to get down the mountain in a thick fog. – That (be) ........must have been...........
................... difficult.

Answer 3

11. We’ve sent for a doctor. – You (send) ..........needn't have sent......... ................... for him. I’m
perfectly well.
12. He (walk) ......may walk............. ................... from here to London in two hours. It isn’t
possible.
13. I had my umbrella when I came out but I haven’t got now. – You (leave)
................... ......might have left............. on the bus.
14. Why didn’t you wait for me yesterday? – I waited five minutes. – You (wait)
.........should have waited.......... ................... a little longer.
15. Perhaps he swam across. – No, he (do) .......mustn't have done............ ................... that; he can’t
swim.

16. We went to a restaurant and had a very good dinner for 3.
17. That carpet was entirely made by hand. – It (take) .........must have taken.......... ................... a long
time.
18. The machine said “you weigh 63 kg,” and I said “Thank you.”
- You (say) ...needn't have said................ ................... anything.
19. I have just watered the roses.
– You (water) .......needn't have watered............ ................... them. Look, it’s raining now.
20. A: I have finished.
B: But you were only half way through when I went to bed. You (work)
..................must have worked. ................... all night.
21. A: I’ve written to Paul.
B: You (write) ........needn't have written........... ................... to him. He’s coming here tomorrow.
You’ll see him before he gets your letter.
22. I left my bicycle here, and now it’s gone. – Someone (borrow) ...................
.........must have borrowed.......... it.