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as与which引导的定语从句的区别 两者均可引导非限制性定语从句，有时可以互换，但下列情况多用as。 1. 关系代词引导的定语从句居句首时。 e.g. As we all know, the earth is round. 2. 当与such,so或the same连用时，用as。 e.g. Such books as you tell me are interesting. I have the same plan as you. Go on Please! 3. 当从句和主句语义一致时，用as，反之则用which。 e.g. She has married again, as was expected. She has married again, which was unexpected. Go on please! 4. as在从句中作主语时，后面常接行为动词的被动语态，如be known，be said，be reported等，如从句中行为动词是主动语态，一般要用which作主语。 e.g. She has been late again, as was expected. Tom has made great progress, which made us happy. as 引导的限制性定语从句 (1) This is the same pen as I lost. This is the same pen that I lost. Please compare: 这本书和我丢的那本一模一样。 这本书就是我丢的那本。 as 引导的限制性定语从句 (2) This is such an interesting book ____ we all like. This is so interesting a book _____ we all like. This is such an interesting book ____we all like it. This is so interesting a book ____we all like it. as that Please complete the following sentences and compare: as that 这是大家都喜欢的如此有趣的一本书。(定语从句) 这本书如此有趣，大家都喜欢。(结果状语从句) 综合考查一：定语从句与强调句 难点三、综合考查 | 
