当mustnt 表示禁止时,附加疑问部分一般用must。如:
You mustnt walk on grass, must you?
前句谓语动词是must have+过去分词时,若前句强调对过去情况的推测(一般有过去时间状语),疑问部分的谓语动词用didnt+主语;若前句强调动作的完成,疑问部分的谓语动词用havent(hasnt)+主语, 例如:
He must have met her yesterday, didnt he?
You must have seen the film, havent you?
陈述句谓语部分出现否定词缀时(前缀或后缀),疑问部分仍用否定结构。例如:He is unfit for his office, isnt he?
如果陈述部分包含有no, never, hardly, seldom, few, little,nowhere, nothing等否定或半否定词时,疑问部分用肯定形式。例如:He is hardly 14 years old,is he?
如果陈述部分的主语为everyone,someone,no one等不定代词,其疑问部分的主语可用he,也可用they。
Everyone knows his job, doesnt he?
Everyone knows their job,dont they?
No one was hurt,were they?
Im late, arent I?
One cant be too careful,can one(you)?
Have a cup of tea, will you?
Lets go there,shall we? Let us go there,will you?
同位语从句跟在名词后面,进一步说明该名词的具体内容。引导同位语从句的名词主要有fact, news, promise, idea, truth等。连接词用that (不用which)及连接副词how, when, where, why等。例如:
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