terday, didn't he?
You must have seen the film, haven't 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, isn't 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,从而疑问部分的谓语动词也可用复数形式。例如：
Everyone knows his job, doesn't he? Everyone knows their job,don't they?
No one was hurt,were they?
如果陈述部分的主语是指示代词this,that等时,疑问部分的主语在形式上与前者不同,但在逻辑上却与前者一致。例如：This is very important,isn't it?
如果陈述部分是 I'm...结构,附加疑问部分一般用 aren't I。
例如：I'm late, aren't I?
如果陈述部分以不定式代词one作主语,附加疑问部分的主语在正式的场合用one,在非正式的场合用you。例如：One can't be too careful,can one(you)?
Have a cup of tea, will you? Let's go there,shall we?
但：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：
His delay is due to the fact that the car went wrong halfway.
The news that our team has won the match is true.
She asked the reason why there was a delay.
关联词只能用whether不能用if表示“是否”的情况如下:
A)在表语从句和同位语从句中。例如：
The question is whether the film is worth seeing.
The news whether our team has won the match is unknown.
B)在主语从句中,只有用it作形式主语时,whether和if都能引导主语从句,否则,也只

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