几个含must的句子 的反意疑问句

1。 You must phone your father, needn’t you? (must表示“必须”) 2。 You mustn’t smoke in the office, must you? （mustn’t表“禁止”） 3。 You must be thirsty, aren’t you? (must表示推测“一定”) 4。 You must have known it, haven’t you? (must表示推测“一定”) 5。 You must have seen the movie last night, didn’t you? (must表示推测“一定”)