Voice
Boil the water and cool it before you keep it in the fridge.

Let the water be boiled by you and cooled by you before it is kept in the fridge.
Let the water be boiled, cooled and kept in the fridge.
Let the water be boiled and cooled before it is kept in the fridge.
Let the water be boiled and cooled before it is kept in the fridge by you.

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Voice
Alexander expected to conquer the world.

It was expected by Alexander that he should conquer the world.
It had been expected by Alexander that he would conquer the world.
It was expected by Alexander that he would conquer the world.
It was expected by Alexander that he will conquer the world.

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

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

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Voice
Someone has lit the fire.

The fire had been lit by someone.
The fire was lit by someone.
You are requested to light the fire by someone.
The fire has been lit by someone.

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