初三英语反义疑问句问题有些词是这样的He must be polite,isn't he?为什么用isn't而不用mustn't呢还有哪些情况也是这样的,请列举出来,

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初三英语反义疑问句问题有些词是这样的He must be polite,isn't he?为什么用isn't而不用mustn't呢还有哪些情况也是这样的,请列举出来,

初三英语反义疑问句问题有些词是这样的He must be polite,isn't he?为什么用isn't而不用mustn't呢还有哪些情况也是这样的,请列举出来,
初三英语反义疑问句问题
有些词是这样的
He must be polite,isn't he?
为什么用isn't而不用mustn't呢
还有哪些情况也是这样的,请列举出来,

初三英语反义疑问句问题有些词是这样的He must be polite,isn't he?为什么用isn't而不用mustn't呢还有哪些情况也是这样的,请列举出来,
初中英语18种特殊的反意疑问句
初中英语18种特殊的反意疑问句
  1.祈使句.祈使句后一般加上will you或won't you构成反意疑问句,用will you 多表示“请求”,用won't you 多表示提醒对方注意.例如:
  Look at the blackboard,will you/ won't you?看黑板,好吗?
  Let引导的祈使句有两种情况:
  1)Let's...,后的反意疑问句用shall we或shan't we.例如:
  Let's go home,shall we/ shan't we?回家吧,好吗?
  还可以用may I来表示征求对方的同意或许可.
  2)Let us/me...后的反意疑问句用will you或won't you.例如:
  Let me have a try,will you/won't you?让我试一试,行吗?
  2.感叹句.感叹句后加反意疑问句时,其反意疑问句需用be的一般现在时态的否定形式.例如:
  What fine weather,isn't it?多好的天气啊,是吧?
  3.当陈述部分谓语动词是need,dare,used to,且这些词被用作实义动词时,其反意疑问句需用do的适当形式.例如:
  He needs help,doesn't he?他需要帮助,是吗?
  4.陈述部分主、谓语是I am...时,反意疑问句用aren't I 或ain't I ,而不是am not I (可用am I not).例如:
  I'm working now,ain't 我在工作,是吗?
  5.陈述部分的主语是everything,nothing,anything或something 时,反意疑问句的主语应用代词it.例如:
  Something is wrong with my radio,isn't it?我的收音机出毛病了,是吧?
  6.陈述部分的主语是 everybody,everyone,anybody,anyone,somebody,someone,nobody,no one,none,neither 时,其反意疑问句的主语需用复数代词they.例如:
  Everyone is here,aren't they?大家都到了,是吗?
  No one knows about it,do they?没有人知道这件事,对吗?
  7.陈述部分的主语是指示代词this或that时,反意疑问句的主语用it,当陈述部分的主语是指示代词these或those时,其反意疑问句的主语用they.例如:
  This is a plane,isn't it?这是一架飞机,是吗?
  These are grapes,aren't they?这些是葡萄,是吗?
  8.陈述部分的主语是不定代词one时,反意疑问句的主语可以用one,也可用you(美式英语用he).例如:
  One should be ready to help others,shouldn't one?每个人都应该乐于助人,是吧?
  9.当陈述部分含有以下这些含有否定意义的词时:few,little,seldom,hardly,never,not,no,no one,nobody,nothing,none,neither等,其反意疑问句需用肯定结构.例如:
  He is never late for school,is he?他上学从不迟到,是吗?
  10.当陈述部分所含的否定词是通过加前缀或后缀构成的,其后的反意疑问句依然用否定结构.例如:
  It is unfair,isn't it?这不公平,是吧?
  11.含有否定含义的词在陈述部分作动词的宾语时,其反意疑问句用肯定结构,也可以用否定结构.例如:
  You got nothing from him,did you?你从他那儿什么也没得到,是吗?
  12.当陈述部分主语是从句、不定式(短语)、动词-ing形式时,反意疑问句的主语应该用it.例如:
  What you need is more important,isn't it?你需要的东西更重要,是吧?
  13.当陈述部分含I think (believe,suppose...)that...结构时,其反意疑问句须与从句的主、谓语保持一致,注意主句的主语必须是第一人称.例如:
  I don't think he will come,will he?我认为他不会来,对吗?
  14.have(has)不是表示“有”的意思,并在句中做谓语时,其反意疑问句的助动词要用do,does,did.例如:
  They had a meeting just now,didn't they?他们刚才开了个会,是吗?
  15.陈述部分有have to 时,其反意疑问句要用助动词的否定形式.例如:
  You have to water the vegetables every day,don't you?你每天都要浇菜,对吧?
  16.陈述部分是there be句型时,其反意疑问句中要用there.例如:
  There was a hospital here,wasn't there?过去这儿有家医院,是吗?
  17.陈述部分有had better时,反意疑问句中要用hadn't.例如:
  We had better go to school at once,hadn't we?我们现在最好马上去上学,好吗?
  18.当陈述部分含有情态动词must时,我们便要分析一下must的含义.如果must 作“一定;要;必须”讲,反意疑问句须用mustn't或needn't;而当must作推测意义“一定是;必定”讲时,反意疑问句则需根据must后的动词原形选用相应的形式.例如:
  He must work hard at physics,mustn't he?他必须努力学物理,是吧?
  Tom must be at home,isn't he?汤姆一定在家,是吧?

must
.当陈述部分有情态动词must,问句有4种情况:
(1)mustn't表示“禁止,不可,不必”时,附加问句通常要用must.
You mustn't stop your car here,must you?   你不能把车停在这地方,知道吗?   
(2)must表示“有必要”时,附加问句通常要用needn't.
They must finish...

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must
.当陈述部分有情态动词must,问句有4种情况:
(1)mustn't表示“禁止,不可,不必”时,附加问句通常要用must.
You mustn't stop your car here,must you?   你不能把车停在这地方,知道吗?   
(2)must表示“有必要”时,附加问句通常要用needn't.
They must finish the work today,needn't they?   他们今天要完成这项工作,是吗?   (3)当must用来表示对现在的情况进行推测时,问句通常要根据must后面的动词采用相应的形式。
He must be good at English,isn't he?   他英语一定学得很好,是吗?   
(4)当must+have done表示对过去的情况进行推测(一般句中有明确的过去时间状语),问句要根据陈述部分谓语的情况用“didn't+主语”或“wasn't/weren't+主语”;如果强调动作的完成(一般没有明确的过去时间状语),问句要用“haven't/hasn't+主语”。   
She must have read the novel last week,didn't she?   她上星期一定读了这本小说,是吗?   You must have told her about it,haven't you?   你一定把这事告诉她了,是吗?
如果你还有更多关于反义疑问句的问题,可以到百度百科里去细细看。链接在参考资料里

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不是看Must,要看后面那个Be!那才是谓语。 如you must be quiet,aren't you?这也是看后面那个Be.那才能做反义疑问句的谓语

let‘s go ,shall we? 因为must let 这类的动词的特殊性··

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