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英语四级语法讲义之比较状语从句

时间:2012-10-29 12:22 来源:未知 作者:xlm
比较状语从句:
  than, as…as…,not so as…,(not) the same as, the+比较级;
  eg:Light travels fast than sound.
  the+比较级:
  eg:The sooner,the better.
  eg:Girls are thus seen as less valuable than boys and art kept at home to do housework while their brothers are sent to school - the prophecy(预言) becomes self- fulfilling, trapping women in a vicious circle (恶性循环) of neglect.
  (1)当……的时候:while, when, as ;
  when:强调一件事情正在发生的时候,另外一件事情突然发生;
  eg:When I was watching TV, my mother came back.
  while:强调两个动作同时进行,一边……一边……;
  eg:My father is cooking while my mother is reading newspaper.
  as:"随时间推移"
  eg:As time went by, the days became longer and longer.
  (2)一……就……:as soon as ,主将从现;用directly,immediately, instantly连接两个句子;一些名词如the minute,the moment, the instant也可表示;no sooner… than, hardly… when后面的句子需要倒装;
  eg:I will write to you the moment/minute I arrived in Paris.
  (3)特殊单词:by the time that, every/each time(使用时后面不要再加when)
  (4)till&until:
  ① 肯定形式表示的意思是"做某事直至某时",动词必须是延续性的;
  否定形式表达的意思是"直至某时才做某事",一般用until,动词为延续性或非延续性都可以;
  eg: I slept until midnight.
  Wait till I call you.
  She didn’t arrive until 6 o’clock.
  ② Until可用于句首,而till通常不用于句首,通常用于句中;
  eg: Until you told me, I had heard nothing of what happened.
  eg:As you sleep you pass through a sequence of sleep states—light sleep, deep sleep and REM (rapid eye movement) sleep—that repeats approximately every 90 minutes
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