No,you can‘t .No,you shouldn’t .No,you mustn 't.这三个回答相应的问句有什

can I have dinner with you today?no,you can't,I'm afraid。I've got a date already,sorry。Can I pick the flower from the tree?No,you should'nt do that。We should leave it there to let other people enjoy it。Can I smoke?No,you mustn't。It is a non-smoking area。And you shouldn't smoke at all because it does you no good。