Question Detail

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

1. He does not fly kites.

Kites are not flows by him .
Kites does not flows by him .
Kites were not flows by him .
Kites was not flows by him .
Kites is not flows by him .

Answer: Option A

2. Sita was reading the Gita.

The Gita was being read by Sita.
The Gita were being read by Sita.
Gita was being read by Sita.
The Gita was read by Sita.

Answer: Option A

Explanation:

Note: Assume if we had "Someone was reading the Gita", then active voice would be,

The Gita was being read.

3. It is time to learn English.

It is time to be learnt English.
It is time for English to be learnt.
It is time for English to learnt.
It is time to be learn English.

Answer: Option B

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. 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.