非限制性定语从句which和as的用法汇总一篇非限制性定语从句which和as的用法 1非限制性定语从句which和as的用法一、相同之处当从句位于主句之后，引导词指代整个主句所表达的全部意义时，as 和which可以互换。
如：The elephant is like a snake,as/which everybody can see.大家都看得出，这头大象像条蛇。
A big earthquake occurred there last night,as/which was reported on TV.据电视报道，昨夜那里发生了大地震。
She is from Shanghai,as/which I know from her accent.她来自上海，那是我从她的口音知道的。
二、不同之处1、as引导非限制性定语从句时，位置比较灵活，可位于主句之前，也可位于主句之中或之后;而which引导非限制定语从句只能位于主句之后，不能位于主句之前。
如：_______ is known to everybody,the moon travels round the earth.A.ItB.AsC.ThatD.Which答案：B_______ is mentioned above,the number of the students in senior highschools is increasing.A.WhichB.AsC.ThatD.It答案：BAir,as we know,is a gas.众所周知，空气是一种气体。
He is very careful,as his work shows.他的工作表现表明他非常谨慎。
as引导非限制性定语从句常有“如同.那样”的含义，因此在一些固定结构中，如：as we know;as is known to all(众所周知)as we all can see(正如我们大家都能看到的那样)as has been said before/above(正如前面所述)as might be imagined(可以想象得到)as might be expected(正如所预料的那样)as is often the case(情况通常是这样)以上种种固定搭配，一般不能用which代替as。
学法新探关系代词as与which在定语从句中有时可以相互替换，但又有不同之处，稍不留心，极易使用不当，出现差错。
对此，笔者剖析了关系代词as与which在定语从句中的用法，以期能够帮助同学们准确把握和运用。
一、关系代词as与which在限制性定语从句中的用法关系代词as、which均可以用于限制性定语从句中，有时可以相互替换，但两者仍有着一定的差异，具体体现在：（1）当定语从句中的先行词为某物，且先行词前面有so,such,the same，as many/much等修饰语时，则只能用as引导限制性定语从句，不能用which引导。
比如：①It’s the same book as I bought yesterday.这本书和我昨天买的一样。
（不能用which代替as）②HongKong is so prosperous a city as is referred to as a shop-ping paradise.香港是一个繁荣的城市，被称为购物天堂。
(不能用which代替as)③These housed are sold atsuch a low price as people expected.这些房子按人们预料的那样低价出售了。
(不能用which代替as)（2）当先行词是表示某物的名词或代词时，且在从句中又做介词宾语时，则不可以用as引导限制性定语从句，只能用which引导限制性定语从句。
如：①Thisis the good car on which I spent all my money.这是我花了所有钱买的那辆好车。
（不能用as代替which）③This is the knife with which we cut the bread.这是我们切面包用的刀。
（不能用as代替which）③There is amountain of which the top is always covered with snow.有一座山顶总是覆盖着雪的山。
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。
He was honest, as/which we can see.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which 指代整个句子不可置于句首只能位于主句后。
1. They d idn’t come to school on time, which made the teacher angry.2. The sports meeting was put off, which astonished (吃惊）us greatly.3. His father died last year, which made it impossible for him to go to school.4. He didn’t pass the exam, which disappointed his parents.as 引导定语从句，位置灵活，可位于句首、句中和句末。
As we all know, China is a developing country.The number of the visitors, as we had expected, was over 200.China is a great country with a long history, a s is known to all.注意:当主句和从句存在逻辑上的因果关系时,主句与从句有因果或并列，从句谓语动词是“系动词+adj" 使用whichOur class has won the volleyball match, which is inspiring.Tom suddenly fell ill, which made us sad. Tom突然病倒，这使得我们很伤心。
as与which引导非限制定语从句（要点精讲）一、as引导非限制性定语从句as引导非限制性定语从句，代替整个主句，对其进行说明，但通常用于像as we all know，as it is known，as is know to all，as it is，as is said above，as always mentioned above，as is usual，as is often the case，as is reported in the newspaper等句式中。
as在非限制性定语从句中作主语、表语或宾语，且引出的从句位置比较灵活，可位于句首或句末，也可置于主句中间。
通常均由逗号将其与主句隔开。
as有“正如……，就像……”之意。
如：The gentleman put on a hat when leaving his house, as was usual in those days.在那些天里，那位绅士就像往常一样在离开家时带上一顶帽子。
（as在从句中作主语）He forgot to bring his pen with him, as was often the case.他忘了带笔，这是常事。
(as在从句中作主语)He is absorbed in work, as he often was.他正在全神贯注地工作，他过去经常这样。
(as在从句中作表语)As we all know, the earth is round. 众所周知，地球是圆的。
(as在从句中作宾语)The two brothers were satisfied with this decision, as was agreed beforehand.两兄弟都对此项决定满意，这项决定事先已达成一致。
(as在从句中作主语)注意：as引导限制性定语从句与非限制性定语从句的区别：1．as引导限制性定语从句常用于下列句型中，在从句中担当主语、宾语或表语。
