Voice
I don't know his whereabouts.

His whereabouts had not been known to me.
His whereabouts are not known to me.
No one knows his whereabouts.
His whereabouts is not known by 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. I cannot draw this picture.

This picture cannot be drawn by me.
This picture could not be drawn by me.
This picture cannot be drawn by I.
This picture could not be drawn by I.

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Voice
James Watt discovered the energy of steam.

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

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Voice
Who teaches you English?

English is taught by whom?
By whom are you taught English?
By whom will you be taught English?
By whom were you taught English?

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