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　　4.as引导定语从句用法

　　(1)As 既可以引导限制性定语从句也可以用于非限定性定句中充当主语，宾语，表语等。

　　常用于以下句型当中：Such/so….. as….  像…..一样  the same …. as… 和…...同样的

　　A computer is so useful a machine as we can use everyday.

　　He is not the same man as he was.

　　(2)引导非限制性定语从句，此时译为“正如，像”等。可以放在句首，句中或句末。

　　As I remember, there were a net bar here.

　　Taiwan is an inseparable part of China, as is known to all.

　　★the same as...和the same that...引导定语从句的区别

　　This is the same bike that I lost yesterday. (同一事物)

　　This is the same bike as I lost yesterday. （同类事物）
 

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