2019年6月大学英语四级重点语法知识:比较状语从句
英语四级重点语法知识: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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