Voice
I don't know his whereabouts.

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

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Voice
A stone struck me on the head.

I was struck on the head by a stone.
I was struck by a stone on the head.
I had been struck by a stone on the head.
My head was struck by a stone.

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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. Do they sell construction material?

Is construction material sold by them?
Does construction material sell by them?
Is construction material selling by them?
Does construction material sold by them?

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