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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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. The Government is building new bridges.

New bridges were built by the government.
New bridges are being built by the government.
New bridges have been built by the government.
New bridges are building by the government.

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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. The telegraph wires have been cut.

Someone have cut the telegraph wires.
The telegraph wires have cut by someone.
Someone has cut the telegraph wires.
Someone has been cut the telegraph wires.

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