Voice
James Watt discovered the energy of steam.

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

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Voice
A child could not have done this mischief.

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

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

You need not use the machine after 5.30 p.m.
You can't 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
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. The poet read his long poem himself.

The long poem was read by the poet himself.
The long poem read by the poet himself.
The long poem is read by the poet himself.
The long poem had been read by the poet himself

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