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IX. Compare the use of the Past Simple and the Present Perfect in the following sentences, translate them

1.I have written several letters today. I wrote several letters yesterday. 2. They have made a new experiment this week. They made a new expe­riment last week. 3. She has been to the theatre this month. She went to the theatre last month. 4. Have you ever been to London? Yes, I've been there once. I went there in 1980. 5. Have you ever seen "Hamlet"? Yes, I've seen "Hamlet" several times. I saw it at our theatre three years ago and at Moscow theatres in 1975 and 1980. 6. He has graduated from Moscow University. He graduated from Moscow University in 1978. 7. He has seen this film. He saw this film yesterday. 8. He has improved his device; you may use it. He improved his device a week ago. 9. He prepared his report ahead of time. Have you prepared your report? 10. The results of this research were published long ago. My friend has already published the results of his discovery.

X. Define the functions of the verb to have in the following sentences. Translate them:

1. They have already passed the examination in electrical engineer­ing. 2. Automated systems have a number of advantages. 4. Gamma rays have no electric charge. 5. Cosmic television has a great future. 6. He had to work hard to complete his investigation in time. 7. The engineer will have to improve the accuracy of this machine-tool. 8. A new method has been used in order to investigate this problem. 9. I have to do this work now. 10. We had to repeat the experiment. 11. Our planet has powerful sources of energy. 12. You will have to go to the library to get this book. 13. I had to leave early because I wasn't feeling well. 14. We've got a new teacher. 15. She has a lot of character and energy. 16. Yesterday I had a bad headache. 17. She will have many new sub­jects next term. 18. The scientist had to stop the experiment. 19. Besides literature, we have to study history and philosophy. 20. The electron has almost the same mass as the proton.

6. Sequence of Tenses

I. Translate the sentences paying attention to the sequence of tenses:

1. He wanted to know what powerful radio stations were being built in our region. 2. The students asked how the strength of the radio wave had been measured. 3. The engineer said they would carry out an experiment with the new transistor device. 4. The reporter asked if the scientific group was working out the design of this new installation. 5. They wished to know what these radio-electronic systems would ensure. 6. I told him that I would let him know the date of the conference. 7. The newspaper wrote that in the modern world people could not imagine their life without radio and television. 8. The teacher said we might complete our drawings next week. 9. The lecturer said that television played an important role in our life. 10. The engineer informed that all the equipment was functioning normally. 11. The chief engineer said that the reconstruction of the plant would begin next year. 12. I was asked whether I could take part in the research work. 13. The students were told that they didn't need to translate the text. 14. We asked if we should have a lecture on electronics next week.

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