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. Can those happy moments be ever forgotten by me?

Will I ever forget those happy moments?
Can I ever forget those happy moments?
Could I ever forget those happy moments?
Shall I ever forget those happy moments?

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Voice
Have you shut the window?

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

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