Voice
You must look into this matter.

This matter may be looked into by you.
This matter should be looked into by you.
This matter has been looked into by you.
This matter into looked by you.

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Voice
The king gave him a reward.

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

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Voice
She wrote a letter.

A letter is written by her.
A letter was written by her.
A letter was being written by her.
A letter is being written by her.

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