He must be in the reading

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He must be in the reading room,__ he ? A.isn't B.mustn't C.wasn't D.won't 为什么选A？

解题思路：动词
解题过程：
He must be in the reading room,__ he ?
A.isn't B.mustn't C.wasn't D.won't
为什么选A？
句意：他现在肯定在阅览室，对吗？
解题：本句考查must的推测用法。现归纳如下：
1.must 的意思是：必须，一定。它的否定回答要用needn‘t 或don’t have to .
Must she leave now? No, she needn't.
2.must的意思是:偏偏,偏要,一般用在疑问句中或者条件状语从句。
1）Why must you talk here? 你为什么偏偏在这儿说话？
2）If you must ask, I will you that you failed the exam.要是你非要问，我就告诉你。你考试考砸了。
3.must表示猜测：一定,想必一定.
(1) must be 表示对现在事情的猜测，它的反问形式和be保持一致。
He must be a teacher，isn‘t he？
它的否定式是can’t.
She can't be a singer.她不可能是名歌手。
(2)must be doing sth 表示对正在发生的事情的猜测,想必正在。
The students must be reading English words. aren’t they?
(3)must have done表示对过去事情的猜测。它的反问形式有三种情况：
有明确的过去时间状语，没有been ，它的反问形式就用：didn‘t
〈1〉It must have rained last night, didn't it?
有明确的过去时间状语，而且有been 它的反问形式就是：wasn‘t 或 weren’t.
〈2〉He must have been to Beijing last year，wasn‘t he？
如果动词谓语隐含和强调完成时,它的反问形式就是：haven't 或hasn't.
〈3〉They must have known for a long time，haven’t they？
本题的分析和句子:He must be a teacher isn't he ?一样。是对现在的情况作推测的.故答案是：isn't ?

最终答案：略

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