Question Detail

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.

1. 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.

2. 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

3. He go to school.

School is went by him.
School was gone by him.
School is gone by him.
School are gone by him.
School is goes by him.

Answer: Option C

4. 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

5. His hard work satisfied me.

I was satisfied for his hard work.
I was satisfied by his hard work.
I was satisfied with his hard work.
I was satisfied at his hard work.

Answer: Option C

Explanation:

Note: We use "with" preposition with word "satisfied"