解析as和 which 引导的非限定性定语

非限制性定语从句在句中主要起补充说明作用,缺少也不会影响全句的理解,但是,非限制性定语从句是英语学习中的一个重点,也是难点,我们必须参透用法,在写作或运用中达到运用自如,成为闪光的金句。

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,as可放在句首、句末,也可插入主句中;which在句中,即主句之后。
  As we know, smoking is harmful to one’s health.

正如我们所知,吸烟有害健康。
  The sun heats the earth, which is very important to us.

太阳给地球带来热,这对我们非常重要。

1.which引导非限制性定语从句解析,下面通过典型例题解析更直观地说明:
1)Alice received an invitation from her boss, ___came as a surprise.
A. it  B. that  C. which  D. as
  答案C. 此为非限定性从句,不能用 that修饰,而用which指代前面整个句子;it使后句成为句子,两个独立的句子不能单以逗号连接。as引导非限制性定语从句一般放在句首,直接排除。句意:爱丽丝收到了老板的邀请,这让她很吃惊。
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。
句意:结果天气非常好,这超出了我们的预期。
3)It rained hard yesterday, ____ prevented me from going to the park.
A. that B. which  C. as  D. it
 答案B.
  在本题中,prevent由于是行为动词,所以正确选项应为B。
句意:昨天雨下得很大,这使我不能去公园。

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.

正如我们所知,吸烟有害健康。

As是关系代词引导非限制性定语从句位于句首。as作know的宾语;

As is known, smoking is harmful to one’s health.

众所周知,吸烟有害健康。
As是关系代词引导非限制性定语从句位于句首,as充当从句的主语,谓语动词known要用被动式,要用系动词连接。

总结: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。

由which和as引导的非限制性定语从句的区别:

1)位置上,as可放在句首、句末,也可插入主句中;which一般放在主句之后(有时也可用as):

As we all know, reading is very important.

众所周知,阅读是非常重要的。

Reading is very important, which we have already known when we were very young.

阅读是非常重要的,我们很小的时候就已经知道了这一点。

(2)意义上,as有正如、按照、正像之意,一般用在肯定句中;which可用于含肯、否定意义的句子中:

He failed in the exam again, as was expected.

正如所料,他考试又不及格了。

He failed in the exam again, which was unexpected.

他考试又不及格,这是出人意料的。

(3)当定语从句所修饰的主句内容是谓语动词的对象时,常用as,如:

She finally stopped crying, as we had expected.

正如我们所料,她终于停止了哭泣。

(4)当关系代词代表主句引起的结果,又做主谓宾补(SVOC)结构中的主语时,多用which:

He passed the exam, which made him delighted.

他通过了考试,这使他很高兴。

原创文章,作者:buffalo106,如若转载,请注明出处:http://www.buffalotone.com/?p=2780

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