Sentences expressing ideas such as request, order, advice, suggestion and prohibition are called imperative sentences. Such sentences are changed into the passive voice in the following manner.
Active: Please lend me your book.
Passive: You are requested to lend me your book.
Active: Please finish this job first.
Passive: You are requested to finish this job first.
Active: Fetch me a glass of water.
Passive: You are ordered to fetch me a glass of water.
Active: Work hard to get good marks in the examination.
Passive: You are advised to work hard to get good marks in the examination.
Active: Do not pluck flowers.
Passive: You are forbidden from plucking flowers. OR Let the flowers not be plucked.
Active: Do it.
Passive: Let it be done. OR You are ordered to do it.
Active: Let him do it.
Passive: Let him be allowed to do it.
Active: Consult a doctor.
Passive: You are advised to consult a doctor.
Use of modals
Sentences that use the modal auxiliary verb are changed into passive in the following manner.
Active: You ought to respect your elders.
Passive: Your elders ought to be respected by you.
Active: You should learn your lesson.
Passive: Your lesson should be learnt by you.