Question Detail

Sahil sharma makes tea.

Tea is made by Sahil sharma.
Tea is made by the Sahil sharma.
Tea was made by Sahil sharma.
Tea has made by Sahil sharma.

Answer: Option A

Explanation:

Note : Rule to make active voice of Simple present sentence :

Passive subject + is/are/am + third form of verb + by + passive object.

1. Switch on the light.

Let the light be switch on.
Let the light should be switched on.
Let the light will be switched on.
Let the light be switched on.
Let the light switched on.

Answer: Option D

2. 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.

3. 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

4. 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.