Voice
A child could not have done this mischief.

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

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Voice
He completed the story on time.

The story completed by him on time.
The story was completed by him on time.
The story had completed by him on time.
The story was being completed by him on time.

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Voice
The poet read his long poem himself.

The long poem read by the poet himself.
The long poem was read by the poet himself.
The long poem is read by the poet himself.
The long poem had been read by the poet himself

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Voice
You should open the wine about three hours before you use it.

Wine should be opened about three hours before you use it.
Wine should be opened about three hours before use.
Wine should be opened by you three hours before use.
Wine should be opened about three hours before it is used.

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