Question Detail

Shut the door.

Let the door be shut.
Let the door is shut.
Let the door was shut.
Let the door are shut.
Let the door be shut.

Answer: Option E

1. Mr. Sharma knows me.

I am known for Mr. Sharma.
I am known with Mr. Sharma.
I am known at Mr. Sharma.
I am known to Mr. Sharma.

Answer: Option D

Explanation:

Note: We use "to" preposition with word "Know"

2. Who wrote this book ?

By whom is this book written ?
By whom was this book written ?
By who was this book written ?
By whom were this book written ?

Answer: Option B

3. I must help him.

He must helped by me.
I must held him.
He must get help from me.
He must be helped by me.

Answer: Option D

Explanation:

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

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

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