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　　●as 的用法：（as 引导定语从句， 在定语从句中作主语、宾语、表语）

　　①如为限制性的，多用于the same …as ; the same as；such …as …; as many/much as；so …as等结构中。如：

　　※I have the same book as you （have）。 我有一本和你的一样的书。

　　Her attitude to him was quite the same as it had always been. （关系代词as和指示代词same连用， 在从句中用作表语， 先行词是same.）

　　。---Why didn‘t you mention that in face of the police just now？

　　--- I thought it was such a minor detail as was hardly worth mentioning.

　　We will only discuss such problems as have something to do with our own interests.

　　Don’t do such things as you are not sure about.

　　There is no such place as you dream of in all this world.

　　比较：I live in the same house that he used to live in.

　　I‘m wearing the same shirt as you wore yesterday.

　　比较：Here is so big a stone as no one can lift. （定语从句）

　　Here is so big a stone that no one can lift it.（结果状语从句）

　　②如为非限制性的，多单独引导一个定语从句，这种定语从句可置于句首，句中或句尾，译为“正如，这一点”。（动词常为know， see， expect， point out， etc.）

　　As we all know， smoking is harmful to one’s health 。 （as 作宾语）

　　=As is known to all， smoking is harmful to one‘s health 。 （as 作主语）

　　=It’s known to all that smoking is harmful to one‘s health 。

　　=Smoking is harmful to one’s health ， as we all know 。（as 作宾语）

　　=Smoking， as we all know， is harmful to one‘ health.

　　He was a foreigner， as I knew from his accent. （宾语， 先行词是前面整个句子）