Question Detail

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

1. He can speak French.

French can spoken by him.
French can be spoke by him.
French can be spoken by him.
French could be spoken by him.

Answer: Option C

2. It is time to do our business.

It is time for our business to be done.
It is time to our business to be done.
It is time our business to be done.
It is time for our business be done.

Answer: Option A

Explanation:

Note: Please note the use of "for"

3. He arrived at the conclusion.

The conclusion was arrived at by him.
The conclusion arrived at by him.
The conclusion had arrived at by him.
The conclusion have arrived at by him.

Answer: Option A

4. 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.