which引导的从句(which引导的是什么从句?)

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1、which引导的是什么从句?
可以引导定语从句,宾语从句,主语从句。
I bought a room yesterday,which used to belong to Tom.(定语从句)
I don't know which one I should buy.(宾语从句)
Which bus we should take is still a question.(主语从句)
which 在定语从句中可以做主语和宾语.做表语只能用that.
如:I found the book which he sent me two years ago.which 做 send sb sth 中的宾语成分 I found the book which belongs to Mary.which 替代book。
做从句的主语: which 在宾语从句和主语从句中和后面的名词一起构成句子中的成分.Which bus we should take is still a question.中和bus 一起做take的宾语.