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17. .




, , . . ( ) It is that/which/who. , , , . :

1. It is the brain that makes man. .

2. It is this factor that underlies the transformation mechanism. .

3. It was Prof. Butler who proposed such an approach. .

4. It is this specificity which accounts for the changes. .

5. It was the study of the inorganic gases behavior that led to the development of the atomic theory. .

It was not until that , : It was not until 1911 that the first satisfactory theory of the atomic structure was formulated. 1911 .

- do/does/did. , , , , -. :

1. These forces do act on the object. .

2. Our research program does require coordinating. .

3. Ancient philosophers did know some mathematics. .

. do/does/did - , : He promised to help us and so he did. .

- . , : 1) In the coming years the researchers` interest may shift from this problem to the understanding of the phenomenon as a whole. 2) Within the framework of this theory we can explain our results quite satisfactorily. , .. ().

. , .

1. Only now do we realize the importance of rainforests.

2. Never did he think of the consequences.

3. Not only this technique do they use nowadays.

4. Here, in the middle, is placed a filter.

5. Here are shown the temperature dependences.

6. Interesting to us is the possibility to reproduce this effect.

7. Crucial for that plan was the following point.

8. Of great significance is the validity of the results.

( . 13). not , , . , , . :

1. This case is not improbable. .

2. River and lake deposits not uncommonly contain remains of organisms which inhabited water. , .

3. It is not unlikely that the enterprise may fail. , .

, , should /could /had /were. , . :

1. Should you meet him, give him my best regards. If you should meet him, give him my best regards.

2. Had we more time, we could easily solve the problem. If we had more time, we could easily solve the problem.

3. Should this continue, the whole region of Texas between Houston and Galveston Bay could be under water. If this should continue, the whole region of Texas between Houston and Galveston Bay could be under water.





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