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, cooled and 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
I bought a new shirt last week.

Last week a new shirt is bought by I.
Last week a new shirt had been bought by me.
Last week a new shirt was bought by me.
Last week a new shirt was bought by I.

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Voice
The children could use the place always.

The place could always be used by the children.
The place has been used by children always.
The place is used by children always.
The place can be used by children.

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