Неличные формы английского глагола. Коптева Н.Ю. - 52 стр.

     4. It is possible that the car has consumed a lot of fuel.
     5. It may be that they have provided the suitable materials for
        the experiment.
     6. It is likely that they have determined the life time of these
        devices.
     7. It is probable that they have compared their results with
        theoretical predictions.
III. Agree with the following negative statements. Develop the situations
     saying that the persons mentioned ought to have done the actions.
     Follow the model.
     Sp.: They didn’t consider the problem from that aspect.
      St.: No, they didn’t. They ought to have considered the problem
           from that aspect.
     1. She didn’t accept their offer.
     2. They didn’t examine the problem in detail.
     3. They didn’t refer to the matter again.
     4. He didn’t take the occasion of encouraging her.
     5. He didn’t provide them with the information they needed.
     6. He didn’t mention the names of those who had helped him.
     7. He didn’t exert every effort to perform the task.
IV. Give short negative answers to the following questions. Develop
    the situations saying you realize now that you should have done
    the action. Follow the model.
    Sp.: Have you observed the process carefully?
    St.: No, I haven’t. But I realize now that I should have observed
         the process carefully.
     1. Have you specified these values?
     2. Have you examined the problem in detail?
     3. Have you used both systems simultaneously?
     4. Have you found a more convenient way to do it?
     5. Have you formed the images in the traditional way?
     6. Have you made an attempt to solve the problem?
     7. Have you studied the general operating principles of this device?
V.   Contradict the following statements. Use «It can’t be so» as an
     opening phrase. Develop the situations saying that the persons
     mentioned can’t have done the actions.
     Sp.: They have produced a similar effect.
     St.: It can’t be so. They can’t have produced a similar effect.

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