定语从句常见关系代词as的基本用法 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(与……相同)；such …as …（如此，这样）; as many/much as（和……一样多）；so/as …as（与……一样）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. 她对他的态度和以前一样。 (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.) ---Why didn't you mention that in face of the police just now? --- I thought it was such a minor detail as was hardly worth mentioning.  ---你刚才为什么不在警察面前提起那件事呢？ ---我认为这是一个微不足道的细节，不值一提。 We will only discuss such problems as have something to do with our own interests. 我们只会讨论与自己利益有关的问题。 高中英语单词听力 初中英语人教版 高中英语课本 比较：I live in the same house that he used to live in. 我住在他以前住过的那所房子里。       I'm wearing the same shirt as you wore yesterday. 我穿的衬衫和你昨天穿的一样。 比较：Here is so big a stone as no one can lift. （定语从句）       Here is so big a stone that no one can lift it.（结果状语从句） （2）如为非限制性的，as还可以单独引导一个定语从句，代替整个主句，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) 众所周知，吸烟有害健康。 =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.   我从他的口音知道，他是外国人。(宾语, 先行词是前面整个句子) 众所周知：As we all know,           As is well-know (to us all)           It’s well-know (to us all) that…           What is well-know is that… 语法填空 1．I wish to thank Professor Smith, without ________ help I would never have got this far. 2．Ellen was a painter of birds and of nature, ________, for some reason, had withdrawn from all human society. 3．Care of the soul is a gradual process in ________ even the small details of life should be considered. 4．That evening, ________ I will tell you more about later, I ended up working very late. 5．Nowadays people are more concerned about the environment ________ they live.