时间:2019-02-13 作者:英语课 分类:英文语法词汇


英语课

   我们都知道,which和as都可以引导非限制性定语从句,有时可以互换使用。但两者的用法又有所不同。何时用which,何时又必须用as?是不是有些傻傻分不清?!来来来,今天就把这个问题一次拎清~~~


  (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.
  Reading is very important, which we have already known 1 when we were very young.
  (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.
  He failed in the exam again, which was unexpected 2.
  (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:
  Jack 3 was admitted into the university, as we had expected.
  (4)固定结构,用as:
  as has been said before as often happens
  as is well known as we all can see
  the same...as such...as
  (5)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.
  (6)在从句中作介词宾语时,用which,如:
  They went to the zoo, after which they saw a film.
  (7)在从句中代表主句中的谓语的整个概念时,常用which,如:
  He can write a letter in English, which I cannot.
  (8)指代主句中某一名词时,多用which,如:
  Beijing, which he was born, is our capital.
  (9)代替主句中的形容词时, 常用which,如:
  Lily thought me clever, which she herself was.
  在定语从句中,相比于which VS that,who VS that,我们对which与as两者区别的关注度要少很多,在遣词造句或是口语表达中,也常常是“跟着感觉走”。

adj.大家知道的;知名的,已知的
  • He is a known artist.他是一个知名的艺术家。
  • He is known both as a painter and as a statesman.他是知名的画家及政治家。
adj.想不到的,意外的
  • I always keep some good wine in for unexpected guests.我总保存些好酒,用来招待不速之客。
  • His promotion was unexpected.他的升迁出人意料。
n.插座,千斤顶,男人;v.抬起,提醒,扛举;n.(Jake)杰克
  • I am looking for the headphone jack.我正在找寻头戴式耳机插孔。
  • He lifted the car with a jack to change the flat tyre.他用千斤顶把车顶起来换下瘪轮胎。
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