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

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Voice
Are the officers finishing the work on time?

Is the work being finished on time by the officers?
Is the work finished on time by the officers?
Was the work being finished on time by the officers?
Was the work finished on time by the officers?

ANSWER DOWNLOAD EXAMIANS APP