Voice
I know him.

He is known by me.
He has been known by me.
He is known to me.
He was known to me.

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

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Voice
Who can count the starts in the sky?

By whom can be stars in the sky counted?
By whom can the stars in the sky be counted?
By whom could the stars in the sky by counted?
By whom could the stars be counted in the sky?

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