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　　●as & which:

　　as & which 引导非限制性定语从句的区别：

　　①位置的不同：

　　which 引导的定语从句只置于所限制的 句子后;as 位置较灵活，也就是说as可置于所限制的句子前面;插在句子中或放在句子后。如：

　　1. He was late again, which made his teacher very angry.

　　2. Jack, as you know, is an honest man. 或Jack is an honest man , as you know.

　　或As you know, Jack is an honest man.

　　②先行词的不同：

　　as引导非限制性定语从句时，其先行词多为一个句子;

　　which引导非限制性定语从句时，其先行词可以是一个词，一个短语或一个句子。

　　He was proud, which his brother never was. (先行词是一个词)

　　She was very patient towards the children, which her husband seldom was.

　　He was proud, which I dislike very much.(先行词是一个句子)

　　He is an honest man, as is known to all.

　　He was a foreigner, as I know from his accent.

　　③as 一般译为"正如""就像"，"这一点"

　　as we all know;as you know; as is known to all; as you see; as we can see; as has been expected; as we have imagined.

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