Voice
I know him.

He has been known by me.
He is known to me.
He was known to me.
He is known by me.

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Voice
A child could not have done this mischief.

This mischief could not be done by a child.
This mischief a child could not have been done.
This mischief could not been done by a child.
This mischief could not have been done by a child.

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Voice
Did he accept your proposal?

Could your proposal be accepted by him?
Was your proposal not accepted by him?
Was your proposal accepted by him?
Had your proposal been accepted by him?

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