Voice
An electrical fault could have caused the fire.

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

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Voice
In the following question, a sentence has been given in Active/Passive Voice. Out of the four/five alternatives suggested, select the one which best expresses the same sentence in Passive/Active Voice. Have you shut the window?

Are the window being shut by you?
Has the window being shut by you?
Are the window been shut by you?
Has the window been shut by you?

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Voice
He knew that his own life was unjust.

It was known to him that his own life was unjust.
It was known to him that his own life had been unjust.
It was known by him that life was unjust.
It was known by him that his own life was unjust.

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