Exercise 20. Open the brackets using the appropriate form of the infinitive.

1. I suppose I must (to be) serious from time to time. 2. Don't listen to him now! He must (to tell) another lie! 3. I think they must (to fail) to receive our telegram. 4. Boy, you mustn't (to be) so rude! You will offend her! 5. "I am afraid I must (to go) now," she murmured. 6. Nothing must (to do) in a hurry. 7. Judging by their behaviour they must (to be) madly in love. 8. She must (to be) a beauty some twenty years ago. 9. I can smell something burning in the kitchen. She must (to forget) to switch off the gas! 10. The children must (to find and to bring) back home at once! 11. We are friends and we must always (to remain) so. 12. He must (to be) a fool to think so. 13. "Who's making such an awful noise?" "The neighbours must (to quarrel) again." 14. She said we must (to come and to see) her baby. 15. If you don't want to be late you must (to take) a taxi. 16. They must (to take) a taxi, that is why they managed to come in time. 17. Aunt said I must (to tidy) up my room every day. 18. He must still (to be) at his office. Let's phone there. 19. It's already 7 p.m. He must (to leave) his office. 20. She must (to live) in this village since she was born.

Exercise 21. Paraphrase the sentences where possible using must.

1. Probably, he is still there. 2. Probably, he hasn't come yet. 3. Probably he will come soon. 4. They can't have failed to receive our telegram. 5. She can't be unaware of what is happening. 6. She can't have said such a thing! 7. He can't have failed to notice us. 8. Evidently he has taken the key with him. 9. Evidently, he has not left the key for us. 10. Probably, she is cooking dinner in the kitchen. 11. Probably, she has already cooked dinner. 12. Can she still be waiting for an answer? 13. Probably, she was offended. 14. Evidently, she'll be offended. 15. I am sure she is offended.

Exercise 22. Translate the sentences into English using must in different meanings.

1. Он быстро и без ошибок перевел этот текст. Должно быть, он хорошо знает английский. 2. Ты должен выписывать и учить все новые слова, иначе твой английский не улучшится. 3. Должно быть, я вас просто не заметил. Там было так много народу. 4. Конечно, она любит своего ребенка! 5. Никому не рассказывай об этом, даже своим ближайшим друзьям. 6. Очевидно, завтра погода улучшится. 7. Вероятно, им уже сообщили об этом. 8. Очевидно, им еще ничего не рассказали. 9. Должно быть, она заметила эту ошибку. 10. Должно быть, она не заметила, как вы вышли. 11. Обязательно приходите к нам на новоселье. 12. Ты должен побыстрее дочитать эту книгу и вернуть ее в библиотеку. 13. Должно быть, дождь уже кончился. 14. Должно быть, в то время шел сильный дождь. 15. Очевидно, скоро пойдет дождь. 16. У вас, вероятно, ушло много времени на то, чтобы отыскать этот дом. 17. Должно быть, он не обратил на это внимания. 18. Его нигде не видели уже неделю. Должно быть, он заболел.

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