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一、引导限制性定语从句which可引导限制性定语从句，指代物，在定语从句中可以充当主语或宾语。如：Where is the paper which I bought this morning?This is a meeting which is of great importance.as引导的限制性定语从句常出现在the same...as, such...as, so...as, as...as等结构中，即当先行词前有such, so, as时，关系词通常用as。如：This is not such a good book as I expected.I live in the same building as he lives in.Here is so big a stone as ……