Exercise VI. Define the tense-forms used in the following sentences and translate them:
1. We have been observing the reaction for an hour.
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2. It took us two hours to complete the experiment.
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3. The once rich soils had turned into desert before they occupied the land.
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4. They will derive the equation on a statistical basis.
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5. The students have done the work before the professor came.
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6. They were not going to study the physiological or physical factors.
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7. The above assumption holds in every situation.
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8. They are going to answer the question by using the mathematical device.
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Exercise VII. Translate the sentences and define the types of the questions:
1. Did she get any letters or newspapers last week?
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2. Dont you know him?
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3. He wants to be the best student at the University, doesnt he?
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4. Who has developed the design?
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5. What can you say about the even and odd numbers?
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6. Did they consider in detail this plan?
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Exercise VIII. Put all possible types of questions to the following sentences:
1. This formulation involves some abstraction.
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2. Such situation is not impossible.
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3. Their views coincided in many respects.
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