Fill in can, have to, may, might, must, need or should. 10. you … not vacuum the carpets because carol has already done it. 11. he … come to my party because he is ill. 12. he … go to the dentist when he has toothache. 13. it's not very important. you … not do it now. you … do it tomorrow. 14. …you speak many languages? 15. i don't know what i'm doing this weekend, but i … go to london. 16. smoking is very unhealthy. you … stop it. 17. you have got plenty of time. you … not hurry. 18. you … have a passport to visit most foreign countries.

10. needn't
11. can't
12. has to
13. needn't // can
14. can
15. may
16. must
17. needn't
18.must

15. avoid, enjoy, give up, keep, mind.

a) verbs always followed by the –ing form (gerund)

b) verbs followed either by the –ing form (gerund) or by the infinitive with little or no change in their meaning

c) verbs followed either by the –ing form (gerund) or by the infinitive with a change in their meaning

15. избегай, наслаждайся, сдавайся, держись, помни.

а) глаголы всегда сопровождаются формой-ing (герундий)

б) глаголы, за которыми следует либо форма –ing (герундий), либо инфинитив с небольшим или вообще без изменения их значения

в) глаголы, за которыми следует либо форма –ing (герундий), либо инфинитив с изменением их значения

1. He will shut up, if he does not forget. 2. He always attend classes if he feels well. 3. We always went to the city if there was no rain. 4. He browses the newspaper at breakfast, if not late. 5. She cursed him if she was delayed. 6. We can do the exercise if you wish. 7. If he wanted to relax, he went to the park. 8. She will tell if something happens. 9. He will be late for a train, if he does not hurry. 10. She never denied anything if she was not sure. 11. She will borrow the magazine if he returns it. 12. He is always nervous if he is not congratulated. 13. She paints if there is a desire. 14. What will he do if he is fired? 15. When she takes an umbrella, rain never happens. 16. He will not freeze if he wears a jacket. 17. When she does not know the word, she searches for it in the dictionary. 18. If he was ashamed of strangers, he began to stutter. 19. If he arrives tomorrow, he will tell everything. 20. If he was concerned, she felt lonely, she would come the next time. 21. If he called him. 22. She is not ashamed to ask when he does not understand something. 23. She would be grateful if he could help. 24. He will be happy if she writes. 25. If he does not, he will be glad if he is at home, he will leave a note.