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as引导的定语从句与which引导的有什么不同?

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as引导的定语从句与which引导的有什么不同?
as引导的定语从句与which引导的有什么不同?
as引导定语从句有两种:
1、非限制定语从句,如as is said, ... as we all know, ... 必须有逗号隔开,引导的定语从句可位于句首、句中、句尾
2、限制性定语从句,such/so ... as... She is sucha clever girl as we all like.不能用which
which也有两种
1.非限 i stayed in the room, which is being used by my uncle.
2. 限制 i stayed in the room which is being used by my uncle.区别就是逗号