Voice
The children could use the place always.

The place is used by children always.
The place has been used by children always.
The place could always be used by the children.
The place can be used by children.

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Voice
He knew that his own life was unjust.

It was known by him that his own life was unjust.
It was known to him that his own life was unjust.
It was known by him that life was unjust.
It was known to him that his own life had been unjust.

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