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英语四级

发布时间: 2016年03月24日

2016英语四级语法讲解:状语从句(5)

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大学英语四级考试涉及的语法知识点多、涉及面宽。对不少考生来说都是一个难题,希望通过本节的学习,考生能对四级语法有更全面的掌握!

5. 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.

(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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