高中士兵考军校-语法总结（37）

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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)

　　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)