She is so nice a girl as we all like.
她是个我们大家都喜欢的如此好的女孩。
It is such an interesting book as we all want to read.
它是一本我们大家都想读的有趣的书。
上面两句中的as就不能用which替换。
(2)当非限制性定语从句放到主句的前面时,引导词只能用as,而不用
which。如:
As is planned,we got there before eight.
正如计划的那样,我们在8点前到达了那儿。 (3)as常用于一些固定结构以及被动结构中。如:
as is well known/as we all know众所周知;
as is said above正如上面所说;
as might be imagined正像所想象的那样;
as is reported如报道所说;
as has been pointed如所指出的那样;
as is expected正如所料;
as is mentioned above正如上面所提到的;
as is often the case正如往常的情况一样 (4)当非限制性定语从句的引导词前面有介词时,只能用which,而不可用
as。如:
He has a new computer,for which he paid nearly ten thousand
yuan.
他有一台新电脑,这台电脑花了他将近一万元。
(5)关系代词仅代表主句中的谓语部分时,从句中谓语部分被省略而只保
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