Voice
A child could not have done this mischief.

This mischief a child could not have been done.
This mischief could not be done by a child.
This mischief could not have been done by a child.
This mischief could not been done by a child.

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Voice
Mona was writing a letter to her father.

A letter has been written to her father by Mona.
A letter was written by Mona to her father.
A letter was being written by Mona to her father.
A letter was written to her father by Mona.

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Voice
They will demolish the entire block.

The entire block will have to be demolished by the
The entire block will be demolished.
The block may be demolished entirely.
The entire block is being demolished.

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