Voice
Somebody should have cleaned the windows yesterday.

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

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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. You should open the wine about three hours before you use it.

Wine should be opened about three hours before you use it.
Wine should be opened by you three hours before use.
Wine should be opened about three hours before use.
Wine should be opened about three hours before it is used.

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Voice
Follow all the instructions carefully.

Instructions may be followed carefully.
Let all the instructions be followed carefully.
All the instructions could be followed carefully.
Let instructions be followed carefully.

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