Question

active to passive of one should keep one's promises

Answer 1

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one's promise should be kept

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Answer 2

Before beginning let us first know what are active and passive voices:

Active voice - A type sentence where in the subject of the sentence precede the object of the sentence.

Passive voice - A type of sentence wherein the object of the sentence precede the subject of the sentence.

Given sentence:

One should keep one's promises.

Passive voice of the given sentence:

One's promises should be kept.