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”。希望本篇能帮助大家减少关系代词的错用,从而准确清晰地掌握关系代词这一语法点~~~