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

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

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Voice
Do you understand what I mean?

Was what I mean understood by you?
What I mean is understood by you?
Is what I mean is understood by you?
What I mean is that understood by you?

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Voice
The king gave him a reward.

He was given a reward by the king.
He was given by the king a reward.
A reward was given by him to the king.
He were given a reward by the king.

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