Question Detail

He Stole my book.

My book was stolen by him.
My book was been stolen by him.
My book were stolen by him.
My book are stolen by him.
My book is stolen by him.

Answer: Option A

1. 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

2. Nobody can catch him.

He can not be caught.
He can not caught.
He could not be cought.
He could not cought.

Answer: Option A

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.