Question

Passive voice :-
1) Go there at once.
2) A boy is writing a novel.
3) I knew the house.
4) Children like mangos.
5) He laughed at the old man.

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Answer 1

1) At once go there.

2) A novel is being written by a boy.3) The house is known by me.

4) Mangoes are liked by the children.

5) Old man was being laughed by him.

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Answer 2

Explanation:

The structure of a sentence in the passive voice

is

object+ past participle of the verb + subject.

1)

You should go there at once.

2)

A novel is being written by a boy

3)

The house is known to me

4)

Mangoes are liked by the children.

5)

The old man was laughed at by him