Question

一个must反意疑问句问题

He must have finished the work by the end of last month,________?(反义疑问句填什么？）
老师给的答案是 hadn`t he?
为什么呢？我知道must表推测是反义疑问句看有没有时间状语，但是这个句子也有时间状语，但是不用didn`t? 为什么呢？
请给我详细的解释，同时告诉我must这类反义疑问句的一般用法，谢谢

Answer 1

这是规律，你要死记住的

.某些特殊句型的反意疑问句：
1)祈使句的反意疑问句：
表示肯定意义的祈使句，即表示“请求，提示”它的反意疑问句用will you 表达：有时也可以用won’t you 表示。
Go home now, will you ?
Close the window, please, will you ?
否定祈使句：以Don’t开始的祈使句：表示“不要……”，用will you 提问：
Don’t be late again, will you ?
Don’t forget to pay your income tax, will you ?
Let’s引导的祈使句表示“建议”，反意疑问句部分是：shall we ?
Let’s go for a walk, shall we ?
Let’s have a rest now, shall we ?
Let me 或 Let us引导的祈使句表示“请求”，反意疑问句部分为will you：
Let me have a try, will you ?
Let us help, will you ?
2) 感叹句的反意疑问句：一律用否定式提问。
What a clever boy, isn’t he ?
What a lovely day, isn’t it?
3) 陈述句含有情态动词must有两种情况：
must表示“必须”，反意疑问句部分为mustn’t…? / needn’t…?
He must study hard at English, mustn’t he? / needn’t he?
You must go home now, needn’t you? / mustn’t you?
We mustn’t be late, must we ?
Must表示推测：“一定，肯定” 反意疑问句部分与must后面的动词呼应
You must be joking, aren’t you?
He must be ill, isn’t he ?
注意：用must对过去的动作推测时，反意疑问句部分的助动词用did或have, 而对过去的状态推测，反意疑问句部分的be动词用was:
She must have finished her work, hasn’t she ? / didn’t she ?
Jack must have arrived here yesterday, didn’t he ?
He must have been a policeman, wasn’t he ?
4) 陈述句中有否定副词：hardly; never; seldom; little; few; nowhere; nothing等词，反意疑问句部分用肯定提问：
Frank hardly goes to parties, does he ?
He has few friends, has he ?
5)复合句的反意疑问句：大多数复合句的反意疑问句都对主句提问：
He was punished because he violated the regulation, wasn’t he?
You never told me that you had been ill, did you ?
注意：I don’t think/suppose/believe/imagine 引导的宾语从句，这种宾语从句的反意疑问句应与从句的主语，谓语部分一致，而且用肯定式的提问。
I don’t suppose anyone will volunteer, will they ?
I don’t believe she has done it, has she ?
I think he will come. won’t he?

反意疑问句前后两部分谓语应是，“肯定陈述＋否定疑问”或“否定陈述＋肯定疑问”
简略问句如果是否定式，not应与be，do，will等系动词、助动词、情态动词缩写
简略问句的主语不用名词，应用人称代词
当说话者的目的不在疑问，而是为了加强语气时，用降调
当说话者的目的在疑问，则用升调
陈述部分含“too...to”时，是否定句
1) 陈述部分的主语是I，疑问部分要用 aren't I.
I'm as tall as your sister，aren't I?
（我和你姐姐一样高，对吗？）
2) 陈述部分的谓语是wish，疑问部分要用may +主语。
I wish to have a word with you, may I?
（我希望可以和你说话，可以吗？）
3) 陈述部分用 no, nothing, nobody, never, few, seldom, hardly, rarely, little等否定含义的词时，疑问部分用肯定含义。
The Swede made no answer, did he / she?
Some plants never blown (开花), do they ?
4) 含有ought to 的反意疑问句，陈述部分是肯定的，疑问部分用shouldn't / oughtn't +主语。
He ought to know what to do, oughtn't he? / shouldn't he?
5) 陈述部分有have to +v. (had to + v.)，疑问部分常用don't +主语（didn't +主语）。
We have to get there at eight tomorrow, don't we?
6) 陈述部分的谓语是used to 时，疑问部分用didn't +主语或 usedn't +主语。
He used to take pictures there, didn't he? / usedn't he?
7) 陈述部分有had better + v. 疑问句部分用hadn't you?
You'd better read it by yourself, hadn't you?
8) 陈述部分有would rather +v.，疑问部分多用 wouldn't +主语。
He would rather read it ten times than recite it, wouldn't he?
9) 陈述部分有You'd like to +v. 疑问部分用wouldn't +主语。
You'd like to go with me, wouldn't you?
10) 陈述部分有must 的疑问句，疑问部分根据实际情况而定。
He must be a doctor, isn't he?
You must have studied English for three years, haven't you? / didn't you?
He must have finished it yesterday, didn't he?
11) 感叹句中，疑问部分用be +主语。
What colours, aren't they?
What a smell, isn't it?
12) 陈述部分由neither… nor, either… or 连接的并列主语时，疑问部分根据其实际逻辑意义而定。
Neither you nor I am engineer, are we?
13) 陈述部分主语是指示代词或不定代词everything, that, nothing, this, 疑问部分主语用it。
Everything is ready, isn't it?
14) 陈述部分为主语从句或并列复合句�
a. 并列复合句疑问部分，谓语动词根据邻近从句的谓语而定。
Mr. Smith had been to Beijing for several times, he should have been in China now, shouldn't he?
b. 带有定语从句，宾语从句的主从复合句，疑问部分谓语根据主句的谓语而定：
He is not the man who gave us a talk, is he?
He said he wanted to visit Japan, didn't he?
c. 上述部分主句谓语是think, believe, expect, suppose, imagine等引导的宾语从句，疑问部分与宾语从句相对应构成反意疑问句。
I don't think he is bright, is he?
We believe she can do it better, can't she?
但此时主语必须是第一人称
如果不是则不能否定从句
如 He thought they were wrong,didn't he.
而不能说weren't they.
15) 陈述部分主语是不定代词everybody, anyone, somebody, nobody, no one等，疑问部分常用复数they，有时也用单数he.
Everyone knows the answer, don't they? (does he?)
Nobody knows about it, do they? (does he?)
16) 带情态动词dare或need的反意疑问句，疑问部分常用 need (dare ) +主语。
We need not do it again, need we ?
He dare not say so, dare you?
当dare, need 为实义动词时，疑问部分用助动词do + 主语。
She doesn't dare to go home alone, does she?
17) 省去主语的祈使句的反意疑问句，疑问部分用will you。
Don't do that again, will you?
Go with me, will you / won't you ?
注意： Let's 开头的祈使句，后用shall we（或用shan't we) ?
Let us 开头的祈使句，后用will you（或won't you）?
Let's go and listen to the music, shall we（或用shan't we)?
Let us wait for you in the reading-room, will you （或won't you）?
18) 陈述部分是"there be"结构的，疑问部分用there省略主语代词。
There is something wrong with your watch, isn't there?
There will not be any trouble, will there?
19) 否定前缀不能视为否定词，其反意疑问句仍用否定形式。
It is impossible, isn't it?
He is not unkind to his classmates, is he?
20) must在表"推测"时，根据其推测的情况来确定反意疑问句。
He must be there now, isn't he?
It must be going to rain tomorrow, won't it?
21)当主句是由so引起的一个句子，而且译为“这么说来”时，疑问部分的谓语形式（肯定或否定）应与主句保持一致。
So you have seen the film, have you?
So he has not been to Beijing ,hasn't he?

Answer 2

这种情态动词的翻译疑问一般用时态形式来表达。