1. I can’t sleep now. And I haven’t (could / been able to) sleep recently.
2. I can come because he might not (can / be able to) come tomorrow.
3. When we went into the house, we (can / could) smell burning.
4. She spoke in a low voice, but I (can / could) understand what she said.
5. We were completely free. We (can / could) do what we wanted.
6. The fire spread through the building quickly but everybody (could / was able
to) escape.
7. They did not want to come with us at first but we (could / were able to)
persuade them.
8. Yesterday we played tennis. He was an excellent tennis player. He (could / was
able to) beat anybody. But in the end of the game I (could / was able) to win.
9. I’m so angry with him. I (can / could) kill him!
10. I don’t know when they’ll be here. They (can / could) arrive at any time.
11. I was so tired that I (could sleep / could have slept) for two days.
12. Why did you stay at a hotel when you went to Kiev? You (could stay / could
have stayed) with us.
13. We (could go / could have gone) away if we had enough money.
14. The trip was cancelled last week. He (couldn’t go / couldn’t have gone)
because he was ill.
15. You’ve been travelling all day. You (must / cannot) be tired.
16. They haven’t lived here for very long. They (must / mustn’t / cannot) know
many people.
17. Did you phone me? I didn’t hear the ring. I (must be / cannot be / must have
been / cannot have been) asleep.
18. He thought about her. He (cannot look / couldn’t look / cannot have been
looking / couldn’t have been looking / mustn’t have been looking) where he
was going.
19. (on the telephone) Hello, (can / may) I speak to John, please.
20. You (can / may / could) smoke if you like.