Voice
Please help me.

You are requested to help me.
You have been requested to help me.
You were requested to help me.
You are being requested to help me.

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

You mayn'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 can'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. Somebody should have cleaned the windows yesterday.

The windows should have been cleaned yesterday.
The windows were not cleaned yesterday.
The windows should be cleaned yesterday.
The windows had to be cleaned yesterday.

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Voice
James Watt discovered the energy of steam.

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

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