Voice
The student has learnt the answer by heart.

The answer was learnt by the student by heart.
The answer by the student was learnt by heart.
The answer is learnt by heart by the student.
The answer has been learnt by heart by the student.

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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 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 and cooled before it is kept in the fridge by you.

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