英语语法学习之关系代词which和as的区别

我们都知道,which和as都可以引导非限制性定语从句,有时可以互换使用。但两者的用法又有所不同。何时用which,何时又必须用as?是不是有些傻傻分不清?!来来来,今天就把这个问题一次拎清~~~

(1)位置上,as可放在句首、句末,也可插入主句中;which一般放在主句之后(有时也可用as):

As we all know, reading is very important.
Reading is very important, which we have already known when we were very young.

(2)意义上,as有正如、按照、正像之意,一般用在肯定句中;which可用于含肯、否定意义的句子中:

He failed in the exam again, as was expected.

He failed in the exam again, which was unexpected.

(3)当定语从句所修饰的主句内容是谓语动词的对象时,常用as,如:

Jack was admitted into the university, as we had expected.

(4)固定结构,用as:

as has been said before as often happens
as is well known as we all can see
the same...as such...as

(5)当关系代词代表主句引起的结果,又做主谓宾补(SVOC)结构中的主语时,多用which:

He passed the exam, which made him delighted.

(6)在从句中作介词宾语时,用which,如:

They went to the zoo, after which they saw a film.

(7)在从句中代表主句中的谓语的整个概念时,常用which,如:

He can write a letter in English, which I cannot.

(8)指代主句中某一名词时,多用which,如:

Beijing, which he was born, is our capital.

(9)代替主句中的形容词时, 常用which,如:

Lily thought me clever, which she herself was.
在定语从句中,相比于which VS that,who VS that,我们对which与as两者区别的关注度要少很多,在遣词造句或是口语表达中,也常常是“跟着感觉走”。

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