时间:2019-01-18 作者:英语课 分类:英文语法词汇


英语课

   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 1 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.
  A. 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。

n.吸烟,抽烟;冒烟
  • He was wise to give up smoking.他戒烟是明智的。
  • He has decided to cut out smoking and drinking.他已决心戒烟、戒酒。
标签: 定语从句
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