Voice
Open the window.

Someone opens the window.
Window is opened.
Open window.
Let the window be opened.

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Voice
The Government is building new bridges.

New bridges were built by the government.
New bridges are building by the government.
New bridges have been built by the government.
New bridges are being built by the government.

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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. I don't know his whereabouts.

His whereabouts are not known to me.
His whereabouts is not known by me.
His whereabouts had not been known to me.
No one knows his whereabouts.

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