One should keep one's promise.

One should keep one's promise. Correct Answer One's promise should be kept.

One's promise should be kept.

The subject 'One' has to be replaced with 'One's promises' keeping the tense same.

Related Questions

If you make a promise, you must keep it. The "If you make a promise" clause is:
Find the most correct "passive voice " for the following "active voice " "One should keep one's promise "
Choose the correct passive form- "One should keep one's promise".
Change the voice of One should keep one's promise
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