`You should keep your promise` বাক্যটির Passive form হবে-
Your promise should be kept by you
Correct
Your promise is to be kept by you
Your promise should keep by you
Your promise should kept by you
Explanation:
Correct Answer is: Your promise should be kept by you
Passive করার নিয়ম: Object কে Sub করতে হয় + tense অনুযায়ী সাহায্যকারী verb (should be) + মূল verb এর Past Participle + by Subject কে object করতে হয়।