You mustn't speak to your mother,---?

当陈述部分含有 must 时, 要注意 must 的含义。 表示 "一定要, 必须"时, 反意疑问句附加部分用 mustn't 或 needn't e。g。 He must work hard at physics, mustn't he? You must renew the book, needn't you? 表示推测 "一定是, 必定是"时, 反意疑问句附加部分有下列情况: A)。 当陈述部分有 must be 。。。时, 反意疑问句附加部分用 be 的现在时态。 e。g。 He must be very tired, isn't he? He must be working hard at the office, isn't he? B)。 must have + 过去分词 表示对过去的推测 a)。 单纯表示对过去的推测, 与现在无关, 反意疑问句附加部分用过去式。 b)。 表示对过去的推测且影响到现在或持续现在, 反意疑问句附加部分用现在完成式。 e。g。 He must have come yesterday, didn't he? You must have studied English for years, haven't you? He must have lived here at least ten years, hasn't he? 你那后面填的是mustn't you或needn't you