含情态动词must的反义疑问句

1、含情态动词must的反义疑问句陈述部分有must，且表示必须时，附加疑问句部分用mustnt，如果表示必要则用neednt。陈述部分中是mustnt表示禁止时，附加疑问句部分用must。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。They must clean the floor, mustnt they/neednt they?他们必须擦地板，是不是？We must stay at home, mustnt we?我们必须留在家里，是不是？We mustnt be late, must/may we?我们不许迟到，是不是？They

2、must work hard, mustnt they?(必须)They must take medical lessons, neednt they?(必要)He must be lying to me, _?A.mustnt be B.must be C.isnt be D.is be 他肯定在对我说谎。must be doing 是对正在进行的事情的推断。还有must have done 是对过去情况的肯定推断。must 这种用法的反意疑问句不用 must 提问。推断用法：He must be lying to me.陈述用法：He is lying to me.陈述用法反意疑问句：He

3、 is lying to me, isnt he?推断用法反意疑问句：He must be lying to me, isnt he?推断用法：He must have been abroad.陈述用法：He has been abroad.陈述用法反意疑问句：He has been abroad, hasnt he?推断用法反意疑问句：He must have been abroad, hasnt he?推断用法：He must have gone swimming yesterday.陈述用法：He went swimming yesterday.陈述用法反意疑问句：He went swi

4、mming yesterday, didnt he?推断用法反意疑问句：He must have gone swimming yesterday, didnt he?He must be a visitor, isnt he?(对现在情况的推测)You must have seen him at his birthday party yesterday, didnt 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,havent you?(强调动作的完成)1 带 have to 时，附加疑问用 do 或

5、 have的相应形式 , 用 do 更常见。 You dont have to go to school on Sundays , do you ? We have to work today , dont we ? (havent we ?)2 带 must时A 表示“必须”，附加疑问部分用 mustnt We must work hard , mustnt we ?B 表示“有必要”时，附加疑问部分用 neednt. The teacher must show concern for each pupil , neednt he ?C 表示“推测”时，附加疑问部分要与陈述部分的谓语动词相呼

6、应。 He must be a teacher, isnt he ? D must + have + done 是对过去情况的推测，当陈述部分没有明确的表示过去的时间状语时，附加疑问要用have的相应形式；当陈述部分有明确的过去时间状语时，附加疑问要用过去时。 You must have lived here for a long time , havent you ? You must have seen him yesterday , didnt you ?E 当陈述部分是 must not , 表示“一定不要” 、“禁止”时，附加疑问除用must 外，还可以用may. I must not tell him , must I ? ( may I ?)3 带 used to 时，附加疑问用 usednt 或didnt . 但口语中倾向于后者。 There used to be an apple tree in the garden , didnt there ? (usednt there ? )4 带need 时，附加疑问用 do 或 need ,应该与陈述部分 need 用法相呼应。 I neednt tell you the answer , need I ? You need to buy a better dictionary , do