Voice
An electrical fault could have caused the fire.

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

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Voice
Every dish which had been cooked by my mother was appreciated by the guests.

The guests appreciated every dish which was cooked.
The guests appreciated every dish which had been cooked by my mother.
The guests appreciated every dish which my mother had cooked.
My mother had cooked every dish which the guests appreciated.

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Voice
The Romans expected to conquer Carthage.

It was expected by the Romans that they would conquer Carthage.
The Romans were expected to conquer Carthage.
The Romans expected to have conquered Carthage.
Carthage was expected to be conquered by the Romans.

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Voice
A big crowd chased him and later the police arrested him.

He was chased by a big crowd and was later the police arrested him.
He was chased by a big crowd and later was arrested by the police.
He was chased by a big crowd and was later arrested by the police.
He was chased by a big crowd and later arrested by the police.

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