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

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

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Voice
A child could not have done this mischief.

This mischief could not be done by a child.
This mischief could not been done by a child.
This mischief could not have been done by a child.
This mischief a child could not have been done.

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Voice
She spoke to the official on duty.

She was spoken to by the official on duty.
The official on duty was spoken to by her
The official was spoken to by her on duty.
She was the official to be spoken to on duty.

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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. Has a dog ever bitten you?

Has a dog ever bites you?
Are you bitten by a dog?
Have you ever being bitten by a dog?
Have you ever been bitten by a dog?

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