Voice
A child could not have done this mischief.

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

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Voice
The principal has granted him a scholarship.

He has granted a scholarship by the Principal.
A scholarship was granted to him by the principal.
A scholarship has granted to him by the principal.
He has been granted a scholarship by the Principal

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Voice
The boys were playing Cricket.

Cricket was being played by the boys.
Cricket was played by the boys.
Cricket has been played by the boys.
Cricket had been played by the boys.

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Voice
Darjeeling grows tea.

Tea is grown in Darjeeling.
Tea grows in Darjeeling.
Tea is being grown in Darjeeling.
Let the tea be grown in Darjeeling.

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