Ответ:

Exercise 1

1. The new rule is explained by the teacher.
2. The new rule is being explained by the teacher.
3. The new rule has been explained by the teacher.
4. The new rule was explained by the teacher.
5. The new rule was being explained by the teacher.
6. The new rule had been explained by the teacher.
7. The new rule is going to be explained by the teacher.
8. The new rule will be explained by the teacher.
9. The new rule can be explained by the teacher.
10. The new rule should be explained by the teacher.
11. The new rule ought to be explained by the teacher.
12. The new rule must be explained by the teacher.
13. The new rule has to be explained by the teacher.
14. The new rule may be explained by the teacher.
15. The new rule might be explained by the teacher.

Exercise 2

1. This architectural monument was restored last year.
2. The article has just been translated.
3. Mr. Brown has already been invited.
4. This news are widely discussed now.
5. All the letters will be sent tomorrow.
6. TV is watched seldom in our family.
7. A new cure for this disease has been found.
8. Meat is not sold in greengrocer's.
9. The room is being decorated now.
10. A new department will be opened next year.