V. The system of the english tenses in the active voice

THE GROUP OF INDEFINITE AND CONTINUOUS TENSES

EXERCISE 7.

Define the tense-form used in the following sentences and translate them.

1. A simple experiment with a glass of water and a postcard will show you how real this pressure is.

2. Fast neutrons can penetrate any material.

3. Do you know what the English call the power of unit?

4. Experiments show us that there is little attraction between the molecules of any gas.

5. As the vibration dies down the intensity of the sound diminishes.

6. If we want to get a lot of power out of a particular engine, we run it as fast as it can go safely.

7. One of the most important phenomena in nature is the transmission of energy from one point to another.

8. Under ordinary circumstances light travels in straight lines and does not bend around the objects.

9. Why do we call this engine "diesel"?

10. The air around us is always under pressure.

11. That we use countless machines today needs no proof.

12. We do not know what results they are waiting for.

13. That the liquid state is normal state-for water is a wellknown fact.

14. Instead of replying to my words he gave me the article he referred to in his report.

15. In the sixties of the last century electrical engineering was just making its first, rather timid, steps.

16. We are using the production of heat by an electric current more and more.

17. The strength of metals decreased as the temperature increased.

18. The mechanical engineer is busy, he is replacing the broken parts of the engine.

19. Commutators require more attention than any other part of the machine.

20. If a current flows through a conductor, it will set up a magnetic field in the neighbourhood of the conductor.

21. The apparatus will be working when you come.

VI. The group of perfect and perfect continuous tenses

EXERCISE 8.

Define the tense-form used in the following sentences and translate them.

1. We have denoted work by the letter W.

2. During recent years methods of measurements have changed considerably.

3. We have just learned the advantages of a diesel engine.

4. At the experimental plant the workers have been applying the new method of screw cutting for a rather long time.

5. The state has provided the institute of nuclear research with necessary facilities.

6. By the end of the year the workers will have installed all the necessary equipment.

7. They will have completed the construction of the next block of the power station by the end of the year.

8. We have been considering the decay of unstable nuclei.

9. By what time will you have erected this bridge?

10. The experiments have shown that light travels with great speed in vacuum.

11. The scientist has discovered that the neutron has no electrical charge.

12. I want to see if these substances have given rise to X-rays.

13. The air around us has always been under pressure.

14. For many centuries scientists of the world have been successfully working to uncover still unsolved secrets of nature.

15. He did not expect that they had published that non-stop flight report in that article.

16. The experiments have shown that magnesium is the lightest of our engineering metals.

17. After I had finished the inspection of the new engine I spoke to the engineer.

18. He will have repaired the engine before you come.

19. A new device for measuring pressure has already been designed.

20. It has taken more time for designing a new satellite.

21. Satellite television has spread all over the world.