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Английский языкАнглийский язык
21 ноября, 06:37

Replace the infinitives by the Past Indefinite, the Present Perfect or the Present Perfect Continuous. 1. At last you (to open) the door. I (to ring) for an hour at least, I think. 2. Here you are at last. I (to wait) for you for ten minutes. 3. The workers (to work) hard since Tuesday. 4. The scientists (to carry out) a lot of experiments before they (to get) positive results. 5. It (not to rain) for a long time. 6. He (to work) at this project for a long time and (not to finish) it yet. 7. How long you (to know) her? I (to know) her for three years. 8. Last night my friends and I (to decide) to stay in town for I lie summer. 9. They (to discover) diamonds in South Africa in the 19th century. 10. The concept of the atom (not to exist) before 1804.

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  1. 21 ноября, 07:47
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    1. At last you have opened the door. I have been ringing for an hour at least, I think.

    2. Here you are at last. I have been waiting for you for ten minutes.

    3. The workers have been working hard since Tuesday.

    4. The scientists had carried out a lot of experiments before they got positive results.

    5. It has not been raining for a long time.

    6. He has been working at this project for a long time and has not finished it yet.

    7. How long have you known her? I have known her for three years.

    8. Last night my friends and I decided to stay in town for the summer.

    9. They discovered diamonds in South Africa in the 19-th century.

    10. The concept of the atom did not exist before 1804.
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