Voice
A stone struck me on the head.

My head was struck by a stone.
I was struck by a stone on the head.
I had been struck by a stone on the head.
I was struck on the head by a stone.

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Voice
Why do you waste time?

Why is time being wasted by you?
Why has time been wasted by you?
Why is time been wasted by you?
Why is time wasted by you?

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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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