2. I think she must be our new teacher, _______? A. don’t I B. doesn’t she C. mustn’t she D. isn’t she 为什么答案一定是D ,B 为什么不对

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2. I think she must be our new teacher, _______? A. don’t I B. doesn’t she C. mustn’t she D. isn’t she 为什么答案一定是D ,B 为什么不对
2. I think she must be our new teacher, _______?
A. don’t I B. doesn’t she
C. mustn’t she D. isn’t she 为什么答案一定是D ,B 为什么不对

2. I think she must be our new teacher, _______? A. don’t I B. doesn’t she C. mustn’t she D. isn’t she 为什么答案一定是D ,B 为什么不对
1 首先,must在这里是表猜测的,解释为“肯定,一定”,不解释为“必须”.
2 再看看 she must be our new teacher的原始句子：she must be our new teacher== I am sure she is our new teacher.
3 这样一来 I am sure 是插入语成分,你可以忽略掉,she is our new teacher的反意疑问句结构是：she is our new teacher,isn't she?
4 再回到你的句子 I think she must be our new teacher,ISN'T SHE --------- i think是插入语成分,你可以忽略掉.这些刚才讲的就构成了反意疑问句结构.

D对，must情太动词这里有表猜测，比较肯定的猜测，真正对应的动词是be 所以D对

D。因为I think 是可以去掉的，然后对be 否定。

情态动词表示推测时，反意问句不能用这一情态动词。而是把句子变为一个无情态动词的句子，再根据这个句子来变反意问句，如 she must be our new teacher=she is our new teacher,所以反意问句为isn't she?

be是she的动词啊。

你看下 must be 这个是系动词,,你就懂了

i think比较特殊，否定疑问是从句部分。我简单点说吧，你不考虑这里是不是must，就句子是she is our teacher 还是she does our teacher这样比较好理解为什么选d了。

反义问句对应的是宾语从句内容。
也就是SHE 的情况，而,不反问情态动词，这是普遍规律

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