Voice
James Watt discovered the energy of steam.

James Watt had discovered energy by the steam.
The energy of steam was discovered by James Watt.
James Watt was discovered by the energy of steam.
The energy of steam discovered James Watt.

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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. He said to me, "What time do the offices close?"

He asked me what time the offices did close.
He asked me what time did the offices close.
He wanted to know what time the offices close.
He asked me what time the offices closed.

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Voice
I don't know his whereabouts.

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

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Voice
The Army chief punished his subordinate.

His subordinate is being punished by the Army chief.
His subordinate was being punished by the Army chief.
His subordinate is punished by the Army chief.
His subordinate was punished by the Army chief.

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