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I. Which is correct.

1. If I’m / I’ll be late this evening, don’t wait for me.

2. Will you write to me if I give / I’ll give you my address?

3. If there is / will be a fire, the alarm will ring.

4. If I don’t see you tomorrow morning, I phone / I’ll phone you in the evening.

5. Do you go / Will you go to the party if they invite / they’ll invite you?

6. I wasn’t tired last night. If I were tired / had been tired, I would have gone home.

II. Put the verb into the correct form.

1. If you took more exercise, you better (feel)

2. If I sold my car, I much money for it (not / get)

3. It will be cheaper, if we by bus (go)

4. If somebody in here with a gun, I’d be very frightened (walk)

5. If you , you’ll miss the train (not / hurry)

6. I didn’t know you were in hospital. If (I / know), (I / go) to visit you.

III. Change the sentences according to the model. Translate into Russian.

A. Model: The experiment is not interesting. I shall not carry it out.

If the experiment were interesting, I should carry it out.

1. The article doesn’t deal with organic chemistry. I shall not translate it.

2. I have no time. I shall not go to the library.

3. He doesn’t feel well. He doesn’t attend lectures.

B. Model: If I knew him, …(I should speak to him.)

1. If she were in the laboratory, she …

2. Provided they prepared for their examination better, they …

3. Were he free, he …

4. Unless he came in time, he …

C. Model: If I had known him before, …(I should have spoken to him.)

1. If he had read that book, he …

2. If she had not been ill, she …

3. Provided they had come earlier, they …

4. If he had been in her place, he …

IV. Open the brackets use the correct verb forms.

1. If they (to find) the exact meaning of this word, they will understand the sentence easily.

2. If he (to work) much at his English, he will pass the exam well.

3. If they had studied the activity of uranium, they (to understand) that phenomenon better.

V. Translate from English into Russian.

1. The canal would not have been opened before the due time, if the builders had not devoted their energy to their work.

2. We should see them, if they were in the shop.

3. I shall be able to write my report today, unless I come home too late.

4. If you study hard, you will know the subject well.

5. If I were in your place, I should do this work myself.

6. If the oil supply had stopped even for a moment, serious damage might have resulted.

7. If you go there by plane, you will come in time for the conference.

8. If the student had been careful during the experiment, he would not have broken the instrument.

9. If you raise the temperature, the water will evaporate.

10. If we didn’t know the nature of radioactive elements, it would be difficult to deal with them.

11. Had we asked the way to the station, we should not have missed the train.

12. Were the expedition to Mars possible, it would give highly interesting results.

13. Could the scientists find out the means to make man’s life longer, it would be a great discovery.