Kelly’s hair looks fantastic. She must have dyed it. 2. Dave can’t _ (be) at home. He’s still on holiday. 3. I saw James leave the burning building. He can’t (be) the person who started the fire. 4. Jill can’t (invite) Fiona to yesterday’s party. It must (be) somebody else. 5. They must (leave) have left together as I saw them get into the same car. 6. It may (rain) this morning as it’s very cloudy. 7. I went to Sam’s house but nobody was there. He must (go) to the office. 8. Look! The door is unlocked. Susan might (forget) to lock it. 9. She can’t (take) an aspirin. She still has a headache. 10. She must (arrive) at the office by now. 11. They can’t _ (live) in a flat. They own a house. 12. She must _ (be) very successful. She’s on the cover of three magazines this month. 13. He looks sad. He must _ (have) some bad news. 14. Lilian can’t _ (finish) her homework. She only started it ten minutes ago. 15. The house could _ (burn down) if the fire brigade hadn’t arrived on time. 16. He must _ (hurt) his leg. He’s limping. 17. Lynn can’t _ (be) at home. She ‘s gone shopping. 18. Julie wasn’t at home this morning. She might (go) to the dentist’s. 19. I can’t (find) my ring. I must (lose) it somewhere. 20. She speaks good English. She might ____ (practise) it in Britain for some time. to -infinitive, infinitive without to or -ing form

Конечно, давайте разберём каждый из предложений и посмотрим, какие формы глаголов нужно использовать.

1. Kelly’s hair looks fantastic. She must have dyed it.

   • must have dyed (инфинитив с to)

2. Dave can’t be at home. He’s still on holiday.

   • be (инфинитив без to)

3. I saw James leave the burning building. He can’t be the person who started the fire.

   • be (инфинитив без to)

4. Jill can’t have invited Fiona to yesterday’s party. It must have been somebody else.

   • have invited (инфинитив с to): "have invited" указывает на прошедшее, но используется в форме "can’t have + V3".
   • must have been (инфинитив с to)

5. They must have left together as I saw them get into the same car.

   • have left (инфинитив с to)

6. It may rain this morning as it’s very cloudy.

   • rain (инфинитив без to)

7. I went to Sam’s house but nobody was there. He must have gone to the office.

   • have gone (инфинитив с to)

8. Look! The door is unlocked. Susan might have forgotten to lock it.

   • have forgotten (инфинитив с to)

9. She can’t take an aspirin. She still has a headache.

   • take (инфинитив без to)

10. She must have arrived at the office by now.

• have arrived (инфинитив с to)

11. They can’t live in a flat. They own a house.

• live (инфинитив без to)

12. She must be very successful. She’s on the cover of three magazines this month.

• be (инфинитив без to)

13. He looks sad. He must have some bad news.

• have (инфинитив без to)

14. Lilian can’t have finished her homework. She only started it ten minutes ago.

• have finished (инфинитив с to)

15. The house could have burned down if the fire brigade hadn’t arrived on time.

• have burned down (инфинитив с to)

16. He must have hurt his leg. He’s limping.

• have hurt (инфинитив с to)

17. Lynn can’t be at home. She’s gone shopping.

• be (инфинитив без to)

18. Julie wasn’t at home this morning. She might have gone to the dentist’s.

• have gone (инфинитив с to)

19. I can’t find my ring. I must have lost it somewhere.

• find (инфинитив без to)
• have lost (инфинитив с to)

20. She speaks good English. She might have practiced it in Britain for some time.

• have practiced (инфинитив с to)

Если у вас есть ещё вопросы по грамматике или другим темам, не стесняйтесь спрашивать!