Voice
The major points of the lesson were quickly learnt by the class,but they were also quickly forgotten by them.

The class learnt and forgot the major points of the lesson quickly.
The class quickly learnt the major points of the lesson but also forgot them quickly.
The class quickly learnt the major points of the lesson but they also forgot them.
The class quickly learnt but forgot the major points of the lesson.

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Voice
I don't know his whereabouts.

His whereabouts had not been known to me.
His whereabouts is not known by me.
No one knows his whereabouts.
His whereabouts are not known to 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. Have you shut the window?

Are the window been shut by you?
Has the window been shut by you?
Are the window being shut by you?
Has the window being shut by you?

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