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422 .
1. Perhaps Nick has left his exercise book at home. 2. Perhaps you left your umbrella in the bus. 3. Perhaps he went to the cafe to wait for us. 4. Perhaps it was Helen who rang you up. 5. Perhaps they came by plane. 6. Perhaps she had a very good English teacher. 7. Perhaps it was too cold for the children to go out. 8. It is possible that he took his children to the zoo. 9. Possibly they did not see us in the crowd. 10. Perhaps Robert used a dictionary. 11. Possibly Mary misunderstood you. 12. Perhaps Henry waited for us there. 13. Possibly Ann returned very late last night. 14. Possibly they have seen the new play.
524
, may.
1. Perhaps he is at home, but I am not sure he is. 2. It is possible that we studied at the same school, but I don't remember her. 3. Perhaps she was proud of her knowledge, but she never showed it to her classmates. 4. Perhaps there was a chance for him to win the match. 5. Perhaps Peter was as capable as the old workers, but he was given no chance to show his skill. 6. Perhaps they will come home very soon: be ready. 7. Perhaps the question was too difficult for her. 8. Try this delicious drink: perhaps you will like it. 9. Why didn't Nick ring us up? It is possible that he forgot about it. 10. It is possible that your brother has never heard about this singer. 11. Perhaps she tried to enter the university, but failed. 12. It is possible that you asked the wrong people, that's why you didn't get the right answer. 13. Perhaps our friends will arrive here tomorrow.
525
may might. , .
1.... I (to ask) you to take off your hat? 2. She asked me if she... (to turn) on the light. 3. I am afraid it... (not to stop) raining by the morning.
4. Don't scold her: the task... (to be) too difficult for her, that's why she made rather many mistakes.
5. If they don't miss the train, they... (to arrive) in time. 6. Why isn't he here yet? What has happened? Oh, he... (to miss) the train. 7. He... (to do) very hard work. That's why he looks so tired now. 8. Don't throw the rest of the birthday cake. He... (to want) it for dessert. 9. It's raining cats and dogs.... I (to borrow) your umbrella, please? 10. Do you know where I left the car keys? You... (to leave) them in the garage. 11. They don't know where the money has gone. It... (to steal).
526
, may.
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527
, must , , . .
1. You must take a taxi if you want to catch that train. 2. You must tell your mother about it. 3. But she must have seen him! 4. Oh, John, think how she must be suffering! 5. Is she waiting? She must have been waiting for an hour. 6. "Oh, Auntie," he answered, "you mustn't talk like that." 7. And remember, you must come and see the baby as soon as you can. 8. You must go home now, Georgie. 9. You must be a fool to think so. 10. The work must have been carried out in secret for quite a long time. 11. The question must be solved before we begin doing anything. 12. Mind, you mustn't spend all the money.
528
, must.
E.g. Probably I left my textbook in the classroom. I must have left my textbook in the classroom.
1. Probably you left your exercise book at school. 2. Evidently she has left the town. 3. Probably Mike has gone to the teachers' room. 4. Probably Tom and Nick are playing football. 5. Probably Helen has got a bad mark. 6. Evidently they have solved the prob-
lem. 7. Evidently the pupils have finished writing their composition. 8. Obviously he forgot to warn them. 9. Evidently the meeting was cancelled.
10. Evidently he forgot to send them a telegram.
11. Evidently there was something wrong with the tape recorder. 12. Probably I left my bag in the canteen. 13. Probably you left your umbrella in the bus. 14. Probably Mary forgot to call me. 15. Probably mother took my umbrella. 16. Probably I have seen you before: your face is familiar to me.
529
, must.
1. I think it is time for the bell to ring. 2. I am almost sure they have this book in the library. 3. Probably he recognized you by your photo in the papers. 4. He is sure to be in at this time. 5. Of course, she is trying to help you. 6. She is certain to be waiting for you at home. 7. Probably he was already ill. 8. There is little doubt that the first experiment failed. 9. No doubt, she knew what she was going to do. 10. I am sure she is fond of the child.
11. They are sure to have taken the wrong turning.
12. Probably he was taken there by car.
530
, must.
1. Probably they have changed the school curriculum. My granddaughter knows a great deal more than I did when I was her age. 2. It is probably a very difficult rule. 3.1 am sure it is pleasant to spend summer in such a picturesque place. 4. You have probably read books of this author before. 5. I feel sure
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426 .
427
they are preparing a surprise for us. 6. These old legends were probably composed about a thousand years ago. 7. It is probably nine o'clock now. 8. He is very old. I think he is nearly eighty. 9. It is probably time to go now. 10. You have been absent very long. I am sure you feel hungry. 11. Where are the children? They are at the river with Nick. I am sure they are having a very good time. 12. He has probably worked very hard to finish his book. 13. She is a very experienced doctor. I am sure she has been working at this hospital for at least fifteen years. 14. Look! Helen's windows are open. I feel sure she is at home. 15. The Smiths have always been great football fans. I am sure they are at the stadium watching the football match.
531
, .
1. She must (to be) mad if she thinks he is going to lend her any more money. 2. They must (to be) upset when they heard the news. 3. You must (to come) and (to visit) us soon. It would be so nice to see you again. 4. It's the third time he's been playing the piano today. He must really (to enjoy) it. 5. Oh, look how white and clean everything is! It must (to snow) at night. 6. Oh, you are all in snow, you look like a snowman. It must (to snow) heavily. 7. Look, what huge snowdrifts there are everywhere, and the path is covered with knee-deep snow. It must (to snow) for several hours already. 8. You look fresh! You must (to have) a good sleep at night. 9. You look very tired. You must (to have) a good sleep at night. 10. He knows mathematics much better than he did last year. He must (to work) a lot in summer. 11. Your mathematics is very poor. You
must (to work) at it in summer. 12. Where is Peter? Oh, he must (to read) in the library. He is getting ready for a very difficult exam. 13. You must (to study) English for several years already. Your language is very good.
532
, must.
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533
.
1. must be trying to find the lost stamp. 2. You must try to find the lost stamp. 3. He must
428 .
have taken it. 4. had to take it. 5. She must be the youngest child in this group. 6. If you want to become a good football player, you must be an all-round athlete. 7. I had to read the letter twice before I understood it. 8. He must have read the letter many times. 9. What must you think of me? 10. They must be talking about us.
534
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535
, must, to have to to be to.
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