Voice
Who did you laugh at?

Who laughed at you?
Who was laughed at by you?
Who had been laughing at you?
Who was laughing at you?

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Voice
They will inform the police.

The police will be informed by them.
The police will inform them.
The police are informed by them.
Informed will be the police by them.

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Voice
All his friends laughed at him.

He was being laughed at by all his friends.
He was laughed by all his friends.
He was being laughed by all his friends.
He was laughed at by all his friends.

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Voice
I don't know his whereabouts.

His whereabouts had not been known to me.
No one knows his whereabouts.
His whereabouts is not known by me.
His whereabouts are not known to me.

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