同学们，昨天我们看过了定语从句注意事项中的不用that的情况，今天来看看如何区分as和which引导的定语从句吧。关系代词as和which引导的定语从句as和which引导非限制性定语从句，有相同之处也有不同之处。具体情况是：

　　1、As和which都可以在定语从句中做主语或者宾语，代表前面整个句子。

　　(1) He married her, as/which was natural.

　　(2) He was honest, as/which we can see.

　　2、as 引导非限制性定语从句，可放在主句之前，或者主句之后，甚至可以切割一个主句；which引导的非限制性定语从句只能放在主句之后。另外，as有“正如……，正像……”的意思

　　(1) As is known to all, China is a developing country.

　　(2) He is from the south, as we can see from his accent.

　　(3) John, as you know, is a famous writer.

　　(4) He has been to Paris more than several times, which I don’t believe.

　　注意：当主句和从句存在逻辑上的因果关系时，常用which。

　　(5) Tom was always late for school, which made his teacher angry.

　　3、当先行词受such, the same修饰时，常用as

　　(1) I have never heard such a story as he tells.

　　(2) He is not such a fool as he looks.

　　(3) This is the same book as I lost last week.

　　注意：当先行词由the same修饰时，偶尔也用that引导定语从句，但是和由as所引导的定语从句意思不同

　　(4) She wore the same dress that she wore at Mary’s wedding.

　　她穿着她在MARY婚礼上穿过的一条裙子。

　　(5) She wore the same dress as her young sister wore. 她穿着和她妹妹所穿的一样的裙子。

　　注意：定语从句such…as …与结果状语从句such… that…的区别：as在所引导的定语从句中作主语，宾语；that在结果状语从句中不做成分

　　(6)He has such a good laptop as I want to buy.

　　(7)He has such a good laptop that I want to buy one

　　1.Great changes have taken place since then in the factory _______we are working.

　　A. where B. that C. which D. there

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　　答案:  A 句子说我们工作那个工厂已经发生了很大的变化，空白处之后为定语从句，而且关系代词在句子中做地点状语，所以自然选择where来做答案。

　　2.I have bought two ballpens, _______ writes well.

　　A. none of them B. neither of them C. neither of which D. none of which

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　　答案：C  句子说我已经买了两支圆珠笔，但是没有一支好写的，这里是两支圆珠笔，none是用来否定三者或三者以上时才能使用的，所答案只能在B和C之间选择，而如果选择B答案，那在空白处之前要有一个连词来表示和前一个句子的关系，所以只有C答案正确。