Răspuns:
1. I'm sure she has given up smoking. **have**
She **must have given up** smoking.
2. I'm sure she isn't feeling sick now. **be**
She **can't be feeling** sick now.
3. Perhaps they were working for the enemy. **have**
They **might have been working** for the enemy.
4. Perhaps he will be on time. **be**
He **might be on time**.
5. Perhaps he was too ill to take part in the race. **been**
He **might have been too ill** to take part in the race.
6. I'm sure they informed the police about the robbery. **have**
They **must have informed** the police about the robbery.
7. Perhaps Harry will be sunbathing this time tomorrow. **be**
Harry **might be sunbathing** this time tomorrow.
8. I'm sure he had warned the soldiers about the coming danger. **have**
He **must have warned** the soldiers about the coming danger.
9. I'm sure Jenny hasn't been working there that long. **have**
Jenny **can't have been working** there that long.
10. Perhaps she was telling you the truth. **been**
She **might have been telling** you the truth.
11. Perhaps she's been working hard. **been**
She **might have been working** hard.
12. Perhaps she'll come with us. **may**
She **may come with** us.
13. I'm sure she hadn't prepared her speech. **have**
She **can't have prepared** her speech.
14. Perhaps he was asleep when we rang. **been**
He **might have been asleep** when we rang.
15. Perhaps he'll be waiting when we get there. **may**
He **may be waiting** when we get there.
16. I'm sure she didn't know about it. **known**
She **can't have known** about it.
17. I'm certain it has stopped raining now. **have**
It **must have stopped** raining now.
18. It's possible that Jane has left already. **have**
Jane **may have left** already.
