Question Detail

It is time to prepare for the game trails.

It is time to prepared for the game trails.
It is time to be prepared for the game trails.
It is time for the game trails to prepared.
It is time for the game trails to be prepared.

Answer: Option D

1. He helps me.

I am helped.
I am being helped.
I am helped by him.
He helped by me.
I am being helped by him.

Answer: Option C

2. Ketan is answering the question.

The question was answered by ketan
The question is answered by ketan
The question is been answered by ketan
The question is being answered by ketan
The question was being answered by ketan

Answer: Option D

3. Someone has stolen his book.

His book is been stolen.
His book has been stolen.
His book is stolen.
His book has stolen.

Answer: Option B

Explanation:

Apart from Rule to make active voice of Present Perfect Tense, which is

Passive subject + has/have + been + third form of verb + by + passive object

Please also note that words like, "someone", "somebody", "people", "police", "public" etc are dropped. But in rare cases we can use them if sentence meaning is not clear.