Voice
The manager could not accept the union leader's proposals.

The union leader's proposals could not be accepted by the manager.
The union leader's proposals were not accepted by the manager.
The union leader's proposals would not be accepted by the manager.
The union leader's proposals will not be accepted by the manager.

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Voice
He teaches us grammar.

Grammar was taught to us by him.
We are taught grammar by him.
We were teached grammar by him.
Grammar will be taught to us by him.

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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, cooled and 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.

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