1. always gets top marks in mathematics because it is his favourite subject and he works a lot at it. If... 2. I did not translate the article yesterday because I had no dictionary. If... 3. We lost our way because the night was pitch-dark. If... 4. The box was so heavy that I could not carry it. That's why I took a taxi. If... 5. I had a bad headache yesterday, that's why I did not come to see you. If... 6. The ship was sailing near the coast, that's why it struck a rock. If... 7. He was not in town, therefore he was not present at our meeting. If . 8. The pavement was so slippery that I fell and hurt my leg. If... 9. They made a fire, and the frightened wolves ran away. If... 10. It is late, and I have to go home. If... 11. I was expecting my friend to come, that's why I could not go to the cinema with you. If... 12. The sea is rough, and we cannot sail to the island. If...
Exercise 4. , : ) , b) .
1. If I am not too busy, I shall go to the concert. 2. They will all be surprised if I make such a mistake. 3. If he doesn't come in time, shall we have to wait for him? 4. If no one comes to help, we shall be obliged to do the work ourselves. 5. If you put on your glasses, you will see better. 6. What shall we do if they are late? 7. Will you be very angry if we don't come? 8. Will he be very displeased if I don't ring him up?
Exercise 5. .
1. , o . 2. , . 3. , . 4. , . 5. , . 6. , . 7. , . 8. , . 9. , . 10. . , . 11. , . 12. , . 13. , . 14. . . , .
(Modal Verbs).
Exercise 1. may can .
1. I... finish the work tomorrow if no one bothers me any more. 2.... we come and see you next Sunday at three o'clock in the afternoon? 3. What time is it? It... be about six o'clock, but I am not sure. 4. Only a person who knows the language very well... answer such a question. 5.... I come in? 6. Let me look at your exercises. I... be able to help you. 7. I... not swim, because until this year the doctor did not allow me to be more than two minutes in the water. But this year he says I... stay in for fifteen minutes if I like, so I am going to learn to swim. 8. Libraries are quite free, and any one who likes... get books there. 9. I... come and see you tomorrow if I have time. 10. Take your raincoat with you: it... rain today.
Exercise 2. , must, may can't.
1. Probably that building in the distance is the station. 2. I don't believe you have lost your passport; probably you have put it into another bag. 3. Perhaps the girl was frightened. 4. Probably you left your text-book in the canteen. 5. I don't believe they will give up such a brilliant idea. 6. You look pale. Probably you are tired. 7. I don't believe that this boy is a good friend. 8. I am sure you are tired: you have been working for hours. 9. Perhaps he visited the Hermitage when he was in St. Petersburg last year. 10. I am sure it is a very deep lake.
