Неличные формы английского глагола. Коптева Н.Ю. - 79 стр.

     3. The calcuiatioins have been performed.
     4. Suitable materials have been found.
     5. A better technique has been employed.
     6. Main features of the new phenomenon have been investigated.
     7. The results have been compared with theoretical predictions.
V.   Restate the sentences using the Gerund. Follow the model.
     Sp.: It is not difficult to observe these phenomena in nature.
     St.: Observing these phenomena in nature is not difficult.
     1. It is necessary to study the problem thoroughly.
     2. It is necesary to confirm these predictions.
     3. It is necessary lo distinguish between these two processes.
     4. It is easy to demonstrate the truth of this hypothesis.
     5. It is sometimes impossible to obtain direct evidence for a
        theory.
     6. It is important to consider the average density of this substance.
     7. It is possible to observe the phenomenon in the laboratory.
VI. Combine each of these pairs of sentences using the Gerund. Follow
    the model.
    Sp.: They have partici pated in that conference. And that is of
       great importance.
    St.: Having partici pated in that conference is of great importance.
     1. They have found a solution to the problem. And that is of great
        value.
     2. He has contributed extensively to that theory. And that is
        known.
     3. He had great difficulties with that problem. And that is known.
     4. They have simplified the procedure of the experiment. And
        that is of great use.
     5. He has suggested an ingenious solution to that problem. And
        that is important.
     6. She has used an ingenious scheme for her experiment. And
        that is valuable.
     7. He proposed a unique procedure of carrying out this experiment.
        And that is of great interest.
VII. Complete the following sentences using the Gerund. Make use of
     the suggested elements. Follow the model.
     Sp.: What is your idea of... (lo solve the problem)

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