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1、关系代词 which 和 as 的区别_代词 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
2、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
3、 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
4、 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。一般放在主句之后有时也可用意义上有正如按照正像之意一般用在肯定句中可用于含肯否定意义的句子中当定语从句主语时多用在从句中作介词宾语时用如在从句中代表主句中的谓语的整个概念时常用如指代主句中某一名词时多用如中也常常是跟着感觉走