Voice
I don't know his whereabouts.

No one knows his whereabouts.
His whereabouts had not been known to me.
His whereabouts are not known to me.
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. Dogs always chase cats.

Cats are being always chased by dogs.
Cats are always chased by dogs.
Cats have been always chased by dogs.
Cats are always chasing dogs.

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Voice
The Minister had already informed his Cabinet about his decision.

His Cabinet was already informed about the Minister's decision.
His Cabinet will have already been informed about the Minister's decision.
His Cabinet has already informed the Minister about his decisions.
His Cabinet had already been informed about his decision by the Minister.

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Voice
This machine must not be used after 5.30 p.m.

You can't use the machine after 5.30 p.m.
You mayn't use the machine after 5.30 p.m.
You must not use the machine after 5.30 p.m.
You need not use the machine after 5.30 p.m.

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