由
as,
which 引导的非限定性定语从句,
as和
which可代整个主句,相当于
and this或
and that。
As一般放在句首,
which在句中。
As we know,
smoking is harmful to one’
s health.
The sun heats the earth,
which is very important to us.
典型例题
1)
Alice received an invitation from her boss, ___
came as a surprise.
http://
yingyu.
chazidian.
comA.
it B.
that C.
which D.
he 答案
C. 此为非限定性从句,不能用
that修饰,而用
which.,
it 和
he 都使后句成为句子,两个独立的句子不能单以逗号连接。况且选
he句意不通。
2)
The weather turned out to be very good, ___
was more than we could expect.
A.
what B.
which C.
that D.
it 答案
B。
which可代替句子,用于非限定性定语从句,而
what不可。
That 不能用于非限定性定语从句,
it不为连词,使由逗号连接的两个句子并在一起在英语语法上行不通。
3)
It rained hard yesterday, ____
prevented me from going to the park..
A.
that B.
which C.
as D.
it 答案
B.
as 和
which在引导非限制性定语从句时,这两个关系代词都指主句所表达的整个意思,且在定语从句中都可以作主语和宾语。但不同之处主要有两点:
(1)
as 引导的定语从句可置于句首,而
which不可。
(2)
as 代表前面的整个主句并在从句中作主语时,从句中的谓语必须是系动词;若为行为动词,则从句中的关系代词只能用
which.。
在本题中,
prevent由于是行为动词,所以正确选项应为
B。
As 的用法
例1.
the same…
as;
such…
as 中的
as 是一种固定结构, 和……一样……。
I have got into the same trouble as he (
has).
例2.
as可引导非限制性从句,常带有’正如’。
As we know,
smoking is harmful to one’
s health.
As is know,
smoking is harmful to one’
s health.
As是关系代词。例1中的
as作
know的宾语;例2中,它充当从句的主语,谓语动词
know要用被动式。
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