1、
2022年12月四级语法知识点：比较状语从句
than, as…as…，not so as…，(not) the same as, the+比拟级;
eg：Light travels fast than sound.
the+比拟级：
eg：The sooner，the better.
eg：Girls are thus seen as less valuable than boys and art kept at home to do housewo
2、rk 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展，一边……一边……;
eg：My father is coo
3、king 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/min
4、ute I arrived in Paris.
(3)特别单词：by the time that, every/each time(使用时后面不要再加when)
(4)till
否认形式表达的意思是“直至某时才做某事“，一般用until，动词为连续性或非连续性都可以;
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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