Voice
One should keep one's promise.

A promise should be kept.
One's promise has to be kept.
One's promise should be kept.
A promise should be keeping.

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Voice
In the following question, a sentence has been given in Active/Passive Voice. Out of the four/five alternatives suggested, select the one which best expresses the same sentence in Passive/Active Voice. Someone saw him picking up a gun.

He was seen by someone pick a gun.
He was seen picking up a gun by someone.
He is seen picking up a gun by someone.
He was seen pick up a gun by someone.

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Voice
In the following question, a sentence has been given in Active/Passive Voice. Out of the four/five alternatives suggested, select the one which best expresses the same sentence in Passive/Active Voice. He said to me, "What time do the offices close?"

He asked me what time the offices did close.
He wanted to know what time the offices close.
He asked me what time the offices closed.
He asked me what time did the offices close.

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