as 和 which 引导定语从句的区别

as 和 which 引导定语从句的区别

先看两道高考题：

1． _____ is known to all，China will be an _____ powerful country in 20 or 30years'time．

A．That；advancing B．This；advanced C．As；advanced D．It；advancing

2．He made another wonderful discovery， _____ of great importance to science．

A．which I think is B．which I think it is C．which I think it D．I think is

分析：第一题考查了 as在从句中作主语的定语从句，意为“正如”，而ad- vanced

country表示发达国家；第二题考查了which引导的非限制性定语从句，I think是插入语。as和 which引导的定语从句，现就其用法作一说明：

一、as1．as用于引导定语从句时，具有“正如 、像 、由 而知”等语义。如：

He was strongly against the plan，as could be expectedAs he hoped he would，he saw the girl2．as引导的定语从句在语义上要和主句保持一致，而which来替代as。如： He married again，as（which）was natural3．as引导的定语从句，其先行词可由以下词来修饰，the same ／as

which来改写，但不可直接替换。如：

4．aswhich

As we have seen，％70％多的面积。） He seemed a foreigner，

5．assee ／／know ／hear等表示感知的动词，且谓语动词前带有情态动词can ／could ／may／

tell ／remember等。如：

It was true，．（这是真的，大家都知道。）

6．asbe或其它连系动词。如是不及物动词，（appears）等。如：

．（他如期昨日返回。）

二、which

1．且关系代词在从句中作主语时，一般要用which，这时which可以用 and that，which surprised us．＝Things then greatly changed，and that surprised us．（那

2 which”，不用“介词＋as”。如： They tried to think of a plan by which they could finish their task ahead of time．（他们试图想个计划，以便提前完成任务。）

三、在与上述几条不冲突的情况下，as和which可以换用。如：

A horse is a useful animal，as ／which everybody knows．（众所周知，马是有用的动物。）

练习：

1．Dorothy was always speaking highly of her role in the play，_____ ，of course，made the others unhappy．（NMET 2000）

A．who B．which C．this D．that