Contradict the following statements. Use “It can't be so” as an opening phrase. Develop the situations saying that the person mentioned can't have done the actions.

Date: 2015-10-07; view: 396.

Re-state the following sentences using “must” with perfect infinitives. Follow the model.

Re-state the following sentences using “may” with perfect infinitives. Follow the model.

Modal Verbs of Probability in the Past.

-They have probably referred to the matter again.

-They may have referred to the matter again.

1. It is likely that they have obtained the necessary data. 2. It may be that he has described the results of the experiment. 3. It is possible that they have provided the suitable materials for the experiment. 4. It is likely that they have determined the life time of these devices. 5. It is probable that they have compared their results with theoretical predictions.

-They have to find a way to avoid such paradoxes.

-The must have found a way to avoid such paradoxes.

1. They have to diminish the pressure.2. They have to perform the calculations in time. 3. They have to find classical liquid structure. 4. They have to limit the heat produced to the proper amount. 5. He must exert every effort to perform the task. 6. The producers are to supply the demands of consumers.

- They have produced a similar effect.

-It can't be so. They can't have produced a similar effect.

1. They have applied the new device. 2. He has changed his viewpoint. 3. He has delivered a report in English.4. They have found topics of mutual interest. 4. They have simplified the procedure of the experiment. 5. They found another method of introducing ions into the system. 6. He has demonstrated the truth of this hypothesis.