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關系代詞as的用法

1. 用于引導限制性定語從句，主要與such, as, the same連用，其意為“像……的”“凡是……的”“……一類的人(物)”。如：

He’s not such a fool as he looks. 他并不像看上去的那樣愚蠢。

He is not such a man as would leave his work half done. 他并不是一個做事半途而廢的人。

You must show my wife the same respect as you show me. 你必須對我妻子表現出與對我同樣的敬重。

He smokes as expensive a cigarette as he can afford. 他抽一種他買得起的最貴的煙。

2. 用于引導非限制性定語從句，根據情況可位于主句之前或之后，有時也可插在主句中間，其意為“這件事”“這一點”。如(www.52ysedu.com)：

He is late, as is often the case. 他遲到了，這是經常的事。

As is usual with children, they soon got tired. 孩子們一貫如此, 他們很快就厭倦了。

David, as you know, has not been well lately. 大衛最近身體不太好，這你是知道的。