Question Detail

It is time to do our business.

It is time for our business to be done.
It is time to our business to be done.
It is time our business to be done.
It is time for our business be done.

Answer: Option A

Explanation:

Note: Please note the use of "for"

1. Please give me a pen.

You are ordered to give me a pen.
You are ought to give me a pen.
You are requested to give me pen.
You are requested to give me a pen.

Answer: Option D

Explanation:

Whenever sentence starts with please or kindly, then in passive voice we use "You are requested to"

2. 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

3. Please keep quiet.

You are told for keep quiet.
You are requested to keep quiet.
You are requested for keep quiet.
You are told to keep quiet.

Answer: Option B

4. 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.

5. Respect your neighbours.

Your neighbours should respected.
Your neighbours should be respected.
Let neighbours be respected.
Let neighbours respected.

Answer: Option B