Ex. 3. Make the following sentences interrogative and negative

Ex. 2. Read and compare the following sentences. Explain the use of the English Tense forms. (Present Perfect, Past Indefinite, Past Perfect, Future Perfect, Future Indefinite, Future Continuous, Present Continuous).

Grammar Rules Patterns.

Я решил эти задачи...

I solved the problems yesterday. (Past Ind.) I have already solved the problems. (Pr. Perf.) I had solved the problems before he came. (Past Perf.)

Я решу эти задачи …

I shall solve the problems tomorrow. (Fut. Ind.) I shall have solved the problems when he comes. (Fut. Perf.) If I solve the problems, will we obtain the required result of the experiment? (Pr. Ind.)

1. a) He has enlarged his English vocabulary lately.

b) He enlarged his English vocabulary when he was in Great Britain.

c) Before he went to Great Britain he had enlarged his English vocabulary.

2. a) How long have you been here?

b) How longago were you there?

c) He wondered how long I had been there.

3. a) Since when have you started working as a teacher?

b) When did you start working as a teacher?

c) By that time she had started working as a teacher.

4. a) The scientists have just changed the order of the whole process.

b) The scientists changed the order of the whole process just now (a moment ago).

c) He said that the scientists had just changed the order of the whole process.

5. a) Perhaps man will improve the devices used in calculations.

b) By the end of this century man will have radically improved the devices used in calculations.

c) Man is going to improve the devices used in calculations radically in the near future.

6. a) Our students will translate this article next week.

b) Our students will be translating the article this time tomorrow.

c) Our students will have translated this article by the time you come.

7. a) I promise I shall find a proper solution of the problem soon.

b) By the middle of the lesson I shall have found a proper solution of the problem.

c) Don’t phone now. I shall be looking for a proper solution of the problem.

8. a) In the future she will try to enter the faculty of Cybernetics.

b) She is going to enter the faculty of Cybernetics after she finishes school.

c) When we meet again, I am sure, she will have become a student of the faculty of Cybernetics.

9. a) They will take part in the international conference on mechanics in a year.

b) They will already have taken part in the international conference on mechanics by the time you come there.

c) This time next week they will be taking part in the international conference on mechanics.

1. By the middle of the 21^st century we’ll have built a lot of space stations. 2. The teacher has just spoken about rational and irrational numbers. 3. By that time natural scientists had learnt to use the parallelogram as a means of addition. 4. A young mathematician has found a better proof of the theorem recently. 5. By the end of the week I’ll have written the second chapter of my dissertation. 6. He has already taken his exam in differential equations. 7. They had done their laboratory work by 2 o’clock. 8. We have just replaced the terms in the equation. 9. This week the students have learnt to perform operations on complex fractions. 10. I had simplified the fractions before multiplying them.

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