Voice
Someone saw him picking up a gun.

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

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Voice
An electrical fault could have caused the fire.

The fire was caused by an electrical fault.
The fire could be caused by an electrical fault.
The fire could have been caused by an electrical fault.
The fire had been caused by an electrical fault.

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Voice
She spoke to the official on duty.

She was spoken to by the official on duty.
The official on duty was spoken to by her
She was the official to be spoken to on duty.
The official was spoken to by her on duty.

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