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МатематикаВопрос:
3. The earth (1) (move) for billions of years. This (2) (mean) that the shape of the seas and the continents (3) (change) all the time and will continue to change in the future. Scientists still (4) (not understand) exactly how this happens, but recent research (5) (give) them a great deal of invaluable information.
Ответ:
Ответ: 1. has been moving, 2. means, 3. is changing, 4. do not understand, 5. gives
Краткое пояснение: Необходимо раскрыть скобки, поставив глаголы в нужном времени.
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Has been moving - Present Perfect Continuous, так как действие началось в прошлом и продолжается до сих пор.
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Means - Present Simple, так как это общеизвестный факт.
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Is changing - Present Continuous, так как действие происходит в данный момент.
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Do not understand - Present Simple, так как это общеизвестный факт.
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Gives - Present Simple, так как это обычное действие.
Ответ: 1. has been moving, 2. means, 3. is changing, 4. do not understand, 5. gives
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- B. Complete the following sentences with the correct time expression below. Use each time expression once only. already ever forever just seldom so far twice a week always for never since yet 1. I've only been waiting here ........... a few minutes. 2. Julie goes to the health club ........... on Mondays and Thursdays. 3. We've ........... heard such nonsense! It's an absolutely crazy idea! 4. Don't wake the baby! She's ........... gone to sleep. 5. Have you ........... spoken to a famous person? 6. They've ........... been interested in music and are very involved in all kinds of musical activities. 7. It's very annoying; she's ........... forgetting where she's put things. 8. Susan's parents ........... go out in the evenings because they finish work very late. 9. ........... today Mrs Philips' secretary has typed three letters for her. 10. We've ........... seen that film, so we don't want to see it again. 11. Hurry up! I can't believe you haven't done this exercise ........... ! 12. Tom has been here ........... five o'clock.
