Выразите запрещение при отрицательной формы глагола “must” (mustn’t) you mustn’t do it вы не должны (вам нельзя) этого делать to come late to your classes; to miss your english classes; to make noise here; to talk at the lectures; to read in the darkness; to call him so late; to smoke in the children’s room;

You mustn't come late to your classes/ You mustn't miss your English classes/ You mustn't  make noise here/ You mustn't talk at the lectures/ You mustn't read  in the darkness/ You mustn't call him so late/ You mustn't smoke in the childrens room.