Question Detail

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.

1. They had not done their tasks.

Their tasks had not been done.
Their tasks had been not done.
Their tasks have not been done.
Their tasks have been not done.

Answer: Option A

2. We ought to have saved our environment.

Our environment ought to had been saved.
Our environment ought to have been save.
Our environment ought to have been saved.
Our environment ought to have saved.

Answer: Option C

3. They may win the battle.

The battle may be win.
The battle may be won.
The battle may be won by them.
The battle may won.

Answer: Option B

4. My friends are watching the match.

The match is watched by my friends.
The match had being watched by my friends.
The match is being watched by my friends.
The match has being watched by my friends.

Answer: Option C

5. Open the window.

Let the window be opened.
Let the window will be opened.
Let the window was opened.
Let the window is opened.
Let the window is been opened.

Answer: Option A