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The theory is now the basis on which all our ideas of the un

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The theory is now the basis on which all our ideas of the universe are built.帮我从语法角度分析这句话.不用翻译.which 修饰什么?
关系代词which的用法
在非限定性定语从句中,只宜用which,不宜用that.
Beijing,which is the capital of China,is a very beautiful city.
在限定性定语从句中which和that在指代物的时候常常可以通用,但是有时只宜用which
而不用that
i.关系代词前面有介词的时候
This is the hotel in which you will stay.
ii.如果有两个定语从句,其中的一句的关系词是that,另一句宜用which.
Let me show you the novel that I borrowed from the library which was newly
open to us.
3.关系代词与介词,关系代词的省略
a) 关系代词和介词
介词放在关系代词的前面时,介词短语只能用which代物,和用whom代人
This is the hero of whom we are proud.
I want to find the very pen with which I wrote that letter.
当介词放在句子的末尾时,可用that/which代物,that/whom/who来作为介词的宾语,
且这个做介词宾语的关系代词往往忽略
This is the hero that (who/whom/忽略) we are proud of.