1. 陈述部分含有must的反意疑问句 陈述句部分谓语动词含有must时,must 如表示“必须”,反意问句用needn’t; 如 mustn’t表示“禁止”,其反意问句部分用 must。 e.g. You must get to school at 8 a .m., needn’t you? You mustn't smoke here, must you? (2) “must + be”表示“推测”时,反意疑问句部 分用be的适当形式。如: She must be a student, isn’t she? (3) 陈述句的谓语部分是“must have + 过去分 词”时,如果这个结构带有一个表示过去 的时间状语,则反意疑问句部分用did作助 动词;如果没有表示过去的时间状语,则 反意疑问句部分用have作助动词。如: They must have finished their work yesterday, didn’t they? They must have finished their work, haven’t they? 2. 陈述部分含有used to和ought to的反意疑问句 (1) 陈述部分谓语动词是used to时,用didn’t或 usedn’t两种方式反问。 e.g. He used to go swimming in summer, didn't/ usedn't he? (2) 陈述部分谓语动词是ought to时,用oughtn’t 反问。 e.g. He ought to be praised for what he has |