一道单选题-06.06.28.03
He really must go now, ___? st he esn't he stn't he st he 选什么,为什么,请指教.
C --must的反意疑问句 (1)如果陈述部分含有表推测的情态动词must,其反问部分不能用情态动词,应根据具体情况而定。 st表示“应该”,其疑问部分用mustn\'t(不应该),如:You must work hard next term, mustn\'t you ? 下学期你应该努力学习,对吗? st表示“必须”,其疑问部分用needn\'t(不必),如:We must go at once, needn\'t we? 我们必须立刻走,是吗? st表示推测,其疑问部分必须与must后面的主要动词相呼应。
如:1)对现在动作或存在的情况的推测: You must know the answer to the exercise, don\'t you?你一定知道这项练习的答案,是不是? That must be your bed, isn\'t it?那一定是你的床,是吗? 2)对过去发生的动作或存在的情况的推测: ①表示肯定 You must have left your bag in the theatre, haven\'t you?你一定是把包落在剧场了,是不是? sterday,didn\'tshe?刘大婶昨天准是到了美国了,对不?②表示否定 表示推测时,否定式通常不是must not,而是can\'t (cannot)。
如: He can\'t have been to your home; he doesn\'t know your address, does he? 他不可能去过你家;他不知道你的地址,是不是? D.陈述部分含情态动词mustn\'t,表示禁止时,附加疑问部分就可以用must或may,如: We mustn\'t be late, must we?(may we?)我们不可以迟到,是吗? 。
B must表推测的用法时 反意疑问句,应该就must后面的动词来变化 后面是实意动词,反意疑问句就用助动词do的某种形式 后面是be动词,反意疑问句就用be动词的某种形式 具体形式根据主语的人称来变化
Choose( B ) 用否定形式。
doesnt he ? 1。当陈述句谓语动词是:must+have+done时,如果是对过去某种情况的推测,且句中有过去的时间状语时,反意疑问句根据动词用:didn't/wasn't/weren't+主语。eg。: (1)You must have read the story last term,didn't you? (2)He must have met her yesterday,didn't he? 2。
当陈述句谓语动词是:must+have+done(过去分词)时,如果只是强调动作的完成情况,反意疑问句用:haven't/hasn't+主语。eg。: (1)She must have arrived there,hasn't she? (2)You must have seen the film,haven't you? 3。
当陈述句谓语动词是:must+do(动词原形)时,是最为复杂的,看下面的例句: (1)You must see the doctor,needn't you? 表示“(主观上)必须”,其疑问部分用needn't(不必),如: We must go at once, needn't we? 我们必须立刻走,是吗? (2)You mustn't do that again,must you? 表示“应该/不应该”或"禁止",其疑问部分用mustn't(不应该)/must(应该),如: You must work hard next term, mustn't you ? 下学期你应该努力学习,对吗? 陈述部分含情态动词mustn't,表示禁止时,附加疑问部分就可以用must或may,如: We mustn't be late, must we?(may we?) 我们不可以迟到,是吗? (3)The food must be nice ,isn't it? 表示推测,其疑问部分必须与must 后面的主要动词相呼应。
如: 1)对现在动作或存在的情况的推测: You must know the answer to the exercise ,don't you? 你一定知道这项练习的答案,是不是? That must be your bed, isn't it? 那一定是你的床,是吗? 总结: 1。
陈述部分有must,且表示"必须"时,附加疑问句部分用mustn't。 2。如果表示"必要"则用needn't。 3。陈述部分中是mustn't表示"禁止"时,附加疑问句部分用must。 4。陈述部分中的must表示"一定"、"想必"等推测意义时,附加疑问句部分而是根据陈述部分的谓语动词或其助动词来定。
练习: 推断用法:He must be lying to me。 推断用法反意疑问句:He must be lying to me, isn't he? 陈述用法:He is lying to me。 陈述用法反意疑问句:He is lying to me, isn't he? 推断用法:He must have been abroad。
推断用法反意疑问句:He must have been abroad, hasn't he? 陈述用法:He has been abroad。 陈述用法反意疑问句:He has been abroad, hasn't he? 推断用法:He must have gone swimming yesterday。
推断用法反意疑问句:He must have gone swimming yesterday, didn't he? 陈述用法:He went swimming yesterday。
陈述用法反意疑问句:He went swimming yesterday, didn't he? He must be a visitor, isn't he?(对现在情况的推测) You must have seen him at his birthday party yesterday, didn't you?(对过去情况的推测,且句中有过去的时间状语) You must have seen him at his birthday party,haven't you?(强调动作的完成) 。
b
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