Answer:
1. Was the new MCB bought by you?
2. Open the door.
3. Grass is eaten by cows.
4. To sow the seeds, farmers depend on the monsoon.
5. A detailed note of the lesson will have been prepared by the teacher.
6. The rules must be obeyed by us.
7. Before the rain was beaten by them, the crops were harvested
Explanation:
There are two kinds of voices in the English language namely; the passive and active voices. An active voice is that wherein the subject performs the action on the verb. In the passive voice, the subject receives the action of the verb. The passive voice is seen in the sentences above. For example, in example 6, the subject, 'We' performs the action of obedience. But in the passive voice, the act of obedience is performed on the subject.