总结定语从句关系代词相关知识点_英语语法定语从句知识点关系代词as用法

1. 用于引导限制性定语从句，主要与such, as, the same连用，其意为“像……的”“凡是……的”“……一类的人(物)”。如：
　　He’s not such a fool as he looks.
　　他并不像看上去的那样愚蠢。
　　He is not such a man as would leave his work half done.
　　他并不是一个做事半途而废的人。
　　You must show my wife the same respect as you show me.
　　你必须对我妻子表现出与对我同样的敬重。
　　He smokes as expensive a cigarette as he can afford.
　　他抽一种他买得起的最贵的烟。
　　2. 用于引导非限制性定语从句，根据情况可位于主句之前或之后，有时也可插在主句中间，其意为“这件事”“这一点”。如(www.yygrammar.com)：
　　He is late, as is often the case.
　　他迟到了，这是经常的事。
　　As is usual with children, they soon got tired.
　　孩子们一贯如此, 他们很快就厌倦了。
　　David, as you know, has not been well lately.
　　大卫最近身体不太好，这你是知道的。

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