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限制性定语从句which what that 等关系词的用法

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限制性定语从句which what that 等关系词的用法
1) 在限制性定语从句中,WHICH,WHOM,WHO 都可以用THAT 来替换..但是如果这些词放在IN,AT,AFTER 之后的时候,不能用that或者用that 代替.
e.g.He is wandering around the community in which he used to live.
which 不能用that 代替.但是in which 可以用where 代替.
2) What 不用来引导定语从句.定语从句中,表示人用WHO,WHOSE,WHOM.表示物用 that,which.What 主要用于主语,宾语,表语从句中.
e,g,What I mean here is that we should make decisions after we understand the situation thoroughly.主语从句
This article is what I acquired from the travel.表语从句
You should ask the salesman what the advantage of his product is before you buy something.