关系代词as与which在用法上的区别

关系代词aswhich在用法上的区别
 
一、引导限制性定语从句时的区别
such, as, the same后只能用as,其他情况用which。如:
You must show my wife the same respect as you show me. 你必须对我妻子表现出与对我同样的敬重。
He’s not such a good writer as he’s cracked up to be. 他并不像人们所吹捧的那样是什么杰出的作家。
The Commission will take as long as is deemed necessary to make its decision. 委员会将用其认为必要长的时间来作出决定。
二、引导非限制性定语从句时的区别
引导非限制性定语从句时,有时两者可互换。如:
I live a long way from work, as [which] you know. 我住得离工作单位很远,这你是知道的。
但在,在以下情况引导非限制性定语从句时,两者不可换用:
①当从句位于主句前面时,只用as。如:
As is usual with children, they soon got tired. 孩子们一贯如此, 他们很快就厌倦了。
As I have already mentioned, I doubt that we will able to raise all the money we need. 正如我早就说过的,我怀疑我们是否能够筹集到足够的资金。
As is often the case with children, Amy was completely better by the time the doctor arrived.  就像经常发生在儿童身上的情况一样,医生赶到时,埃米的病情彻底地好转了。
as引导的非限制性定语从句应与主句在意义上和谐一致,而which则无此限制。如:
She married him, as [which] was natural. 她嫁给了他,那是自然的事。
She married him, which was disgraceful. 她嫁给了他,那是很丢人的。(不用as)
as引导非限制性定语从句时,先行词通常不能是主句中某个具体的词,而应是整个句子、整个短语或某个短语推断出来的概念,而which则无此限制。如:
The government, which promises to cut taxes, will be popular. 这个政府,它保证要减税,将会是得人心的。
The lawyers are preparing for the trial, which commences in 30 days. 律师们正在为这场将于30天后开始的审判进行准备。
The new bourgeoisie, which was created by the Industrial Revolution, had money to spend and wanted to travel. 工业革命产生的新兴资产阶级有了闲钱就想出去旅游。
④当as引导非限制性定语从句作主语时,其谓语通常应是连系动词,而不宜是其他动词,而which则无此限制。如:
She has married again, as [which] seemed natural. 她又结婚了,这似乎很正常。
She has married again, which delighted us. 她又结婚了,这使我们很高兴。(不用as)
 

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