1 定语从句 1.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.) 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 . PS：the same… .as 与 the same… .that 的异同 Eg：this is the same tool as I used last time. (和… ..同一类) This is the same tool that I used last time （和… ..同一个） ●as & w hich: 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" which 没有这个意思 as we all know；as you ...
