Question Detail

We must have obeyed our teachers.

Our teachers might have obeyed.
Our teachers might have been obeyed.
Our teachers must have been obeyed.
Our teachers must have obeyed.

Answer: Option C

Explanation:

If we have "Subject + Modal Auxiliary verb + have + third verb + object"
then we change it to

Passive subject + Modal Auxiliary verb + have been + third form + by + passive object.

Modal Auxiliary verb are : can, could, shall, will, may, might, should, would, must, ought to etc.

1. The police caught the culprit.

The culprit were caught be the police.
The culprit was caught be the police.
The culprit caught be the police.
The culprit had caught be the police.

Answer: Option B

2. We help the poor.

The poor is helped by us.
The poor are helped by we.
The poor are help by us.
The poor are helped by us..
The poor was helped by us.

Answer: Option D

3. He like people to respect him.

He like respect.
He likes to be respected.
He like to be respected.
He want to be respected.

Answer: Option C

4. He found the student guilty.

The student was found to be guilty by him.
The student was found guilty by him.
The student was found to guilty by him.
The student found to be guilty by him.

Answer: Option A

5. After driving Professor Jones to the museum she dropped him at his hotel.

After she was driven Professor Jones to the museum she had dropped him at his hotel.
After she had driven Professor Jones to the museum she had dropped him at his hotel.
Professor Jones was being driven dropped at his hotel.
After being driven to the museum, Professor Jones was dropped at his hotel.

Answer: Option D