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in which ,for which ,on whch ,at which d的不同用法

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in which ,for which ,on whch ,at which d的不同用法
这些都是定语从句里面,由which引导的定语从句,介词提前.
in which 可以翻译成在.里面
for which 可以翻译成为了.目的
on whch 可以翻译成在.的上面
at which 可以翻译成在.里面或在.上面
这些介词的使用除了意思上的区别,具体是要以which引导的从句而定的
例如 (1) The school (that/which) he once studied in is very famous."
  = The school in which he once studied is very famous. 
(2) Tomorrow I will bring here a magazine (that/which) you asked for.   
= Tomorrow I will bring here a magazine for which you asked.   
(3) I have a dresser in my bedroom, which there are many cosmetics on.
= I have a dresser in my bedroom on which there are many cosmetics.
(4 ) The dumpling House which he often has dumplings at is very popular.
= The dumpling House is very popular, at which he often has dumplings.
当然这只是介词作为基本意思的用法,还有一些固定搭配,得具体情况具体分析.
例如 The plane may be several hours late,in which case there's no point in our waiting.
(固定搭配:in the case)
The speaker paused to examine his notes,at which point a loud crash was heard.
( 固定搭配:at the point)
Ten years of hard work changed her greatly,for which reason he could hardly recognize her at first sight. (固定搭配:for the reason)