Voice
I don't know his whereabouts.

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

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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. Many children have been kidnapped by the militants.

The militants kidnapped many children.
The militants had kidnapped many children.
The militants have kidnapped many children.
The militants are kidnapping many children.

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Voice
Who teaches you English?

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

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