定语从句之专题三
as引导定语从句（系统讲解内在原理）
（本文节选自高伟《魔方英语语法》第十一章第四节。已经登记版权，请勿用于商业用途。）
（原文标题：as(代词)引导定语从句和as(连词)引导评述性状语从句）
分两大类情况讲解：
|
as |
与that/which区别 |
|
（一）一般地，主句后无逗号时， as(代词)引导限制性定语从句 |
注意as从句与that从句的区别： such…as与such…that the same…as与the same…that |
|
（二）一般地，主句后有逗号时， as(连词)引导评述性状语从句 |
注意as从句与which从句的区别： which(代词)引导非限制性定语从句。 |
下边详细讲解。
（一）as(代词)引导限制性定语从句
1. 当先行词是“such/the same+名词”时，用as引导定语从句。即，such+n.+as(代词)，the same +n.+as(代词)。
例句（as指代such+n.，作主语/宾语/表语）
●We invited all such people as were likely to come.
（as在从句中作主语。as=all such people，即，All such people were likely to come.）
●I have never heard such stories as he tells. 我从未听说过他讲的这类故事。
（as在从句中作宾语。as=such stories，即，He tells such stories。）
●I’ve never seen such a fool as he is.
（as在从句中作表语。as= such a fool，即，He is such a fool.）。
例句（as指代the same +n.，作主语/宾语/表语）
●Is this the same mosquito as bit you just now？（as作主语。The same mosquito (=as) bit you.）
●This is the same knife as I lost yesterday.（as作宾语。I lost the same knife (=as) yesterday.）
●She is just the same person as she used to be.（as作表语。She used to be the same person (=as).）
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