Voice
Someone saw him picking up a gun.

He was seen by someone pick a gun.
He is seen picking up a gun by someone.
He was seen pick up a gun by someone.
He was seen picking up a gun by someone.

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Voice
Did he accept your proposal?

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

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Voice
Das has posted the letter.

The letter has been posted by Das.
The letter was posted by Das.
The letter have been posted by Das.
The letter had been posted by Das.

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