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

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

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Voice
Who teaches you English?

By whom are you taught English?
By whom will you be taught English?
By whom were you taught English?
English is taught by whom?

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Voice
An electrical fault could have caused the fire.

The fire had been caused by an electrical fault.
The fire could be caused by an electrical fault.
The fire could have been caused by an electrical fault.
The fire was caused by an electrical fault.

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Voice
People say that he is a spy.

It is said by people that he is a spy.
It was said that he is a spy.
It is said that he is a spy.
It has been said that he is a spy.

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