Put the following sentences in to the passive voice.

Date: 2015-10-07; view: 412.

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.

Re-state the following sentences. Follow the model.

-He could test the device, but he didn't try.

-He could have tested the device if he had tried.

1. He could improve the device, but he didn't try. 2. He could answer the questions, but he didn't try. 3. You could encourage their discussion, but you didn't try. 3. They could check these figures, but they didn't try. 4. You could simplify the procedure of the experiment, but you didn't try. 5. They could make use of the new scheme, but they didn't try.

5. Should+ perfect infinitive.

-Have you observed the process carefully?

-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? 3. Have you found a more convenient way to do it? 4. Have you formed the images in the traditional way? 5. Have you made an attempt to solve the problem? Have you studied the general operating principles of this device?

-They must have overlooked this possibility.

-This possibility must have been overlooked.

1. They must have underestimated the results. 2. They should have extended the conception to include this case too. 3. They may have disregarded smaller defects. 4. They must have postponed the further work. 5. They must have overestimated the potentialities of this technique. 6. They could have reorganized the physics department long ago. 7. They must have violated the conservation law. 8. They might have neglected smaller errors. 9. They should have included other works in the review. 10. They could have estimated this contribution more precisely.