Voice
Open the window.

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

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Voice
We will not allow them to run away.

They are not allowed to run away.
They were not allowed to run away.
They would not be allowed to run away.
They will not be allowed to run away by us.

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Voice
All vulnerable places are kept under constant vigil by the Policemen.

The Policemen will be keeping all vulnerable places under constant vigil.
The Policemen keep all vulnerable places under constant vigil.
The Policemen will keep all vulnerable places under constant vigil.
The. Policemen are keeping all vulnerable places under constant vigil.

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