Voice
Somebody should have cleaned the windows yesterday.

The windows were not cleaned yesterday.
The windows had to be cleaned yesterday.
The windows should be cleaned yesterday.
The windows should have been cleaned yesterday.

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Voice
The king gave him a reward.

A reward was given by him to the king.
He was given a reward by the king.
He were given a reward by the king.
He was given by the king a reward.

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Voice
The boy laughed at the beggar.

The beggar was laughed at by the boy.
The beggar was being laughed at by the boy.
The beggar was laughed by the boy.
The beggar was being laughed by the boy.

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