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
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. Why didn't you invite him for the party?

Why he not invited by you for the party?
Why was he not invited by you for the party?
Why didn't he invited by you for the party?
Why couldn't he be invited by you for the party?

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Voice
The children could use the place always.

The place could always be used by the children.
The place can be used by children.
The place is used by children always.
The place has been used by children always.

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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. I don't know his whereabouts.

His whereabouts had not been known to me.
His whereabouts is not known by me.
No one knows his whereabouts.
His whereabouts are not known to me.

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