Hello, there: I saw a grammar book which instructs passive voice.One of the sentences is about the passive voice of imperative mood. For example: Active form:Give up smoking. Passive voice:Let smoking be given up. Also, Negative: Active form: Don't open the door. Passive form: Don't let the door be opened. My question is that I am wondering if the passive voice of imperative mood is common or not. I checked the archive about the passive voice.However,I could not find the answer. May I have your opinion? Thanks a lot!