关系代词as经典用法
其中关系代词as在从句中担当主语、宾语或表语。
We have found such materials as are used in their factory.
我们已经到了像他们工厂里用那种材料。(as作主语)限制性从句
These houses are sold at such a low price as people expected.
(as作宾语)这些房子以人们期望低价出售。
He is not the same man as he was.他和过去不同了。(as作表语)
4.关系代词as，which区别
(1)as引导非限制性定语从句，既可在主句前，又可在主句后，有时还可插入主句中，而which引导非限制性定语从句只能置于主句之后。相同是两者都可替代主句整个内容，而不是主句中某一个词。
The weather turned out to be very good，which was more than we could expect.
(2009·山东高考)Whenever I met her， was fairly often，she greeted me with a sweet smile.
A.who B.which
C.when D.that
选 句意：不管我何时遇见她，她都用甜甜微笑迎接我，这是常事儿。which引导非限制性定语从句，指代前面句子。故选B。
(2)当非限制性定语从句放在主句前面时，只能用as。
As is known to everybody，the moon travels round the earth once every month.
＝The moon travels round the earth once every month，as/which is known to everybody.
＝It is known to everybody that the moon travels round the earth once every month.
＝What is known to everybody is that the moon travels round the earth once every month.
后两句属名词性从句范畴。
(3)as意为“正如……”，后面谓语动词多是see，know， expect，say，mention，report，announce等；which意为“这一点”。
As is known to all，Edison invented the telephone.
＝Edison invented the telephone，as is known to all.
(2009·西安八校联考)A war is so cruel that it always causes great losses， has happened in Iraq.
A.what B.as
C.that D.one
选 as为关系代词，引导定语从句，指代前面整个句子。故选B。
[注意] (as...(定语从句)像……那样，(状语从句)如此……以至于……
This is such an easy question as I can answer.(定语从句)这是一个我能回答简单问题。
This is such an easy question that I can answer it.(状语从句)这是个简单问题，我能回答。
(2009·福州检测)Mount Wuyi is such an attractive place of interest everyone likes to visit.
A.that B.as
C.which D.what
选 as everyone likes to visit是定语从句，修饰先行词place，as在从句中作visit宾语，此句是“as...”结构。如果理解为结果状语从句而选择A项，需要在题干中visit后加上it。故选B。
(2)as...表示相似东西， 表示同一人或物
This is the same knife as I lost.这把小刀和我丢那把一样。
This is the same knife that I lost.这把小刀就是我丢那一把。
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