大学英语四级语法部分虽不单独设题，但贯穿于听、读、写、译各题型中。扎实的语法基础，是达成全方位突破的首要条件。新东方在线整理了2025年12月英语四级高级语法：状语从句之比较状语，供各位考生参考。
2025年12月英语四级高级语法：状语从句之比较状语
5. 比较状语从句：
than, as…as…，not so as…， 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 becomes self- fulfilling, trapping women in a vicious circle of neglect.
当……的时候：while, when, as ;
when：强调一件事情正在发生的时候，另外一件事情忽然发生;
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.
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.
特殊单词：by the time that, every/each time
till">① 一定形式表示的意思是"做某事直至某时"，动词需要是延续性的;
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 didnt arrive until 6 oclock.
② Until可用于句首，而till一般不需要于句首，一般用于句中;
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 sleep—that repeats approximately every 90 minutes.
以上就是新东方在线大学英语四级频道为大伙收拾的“2025年12月英语四级高级语法：状语从句之比较状语”，期望大伙可以更好的学会大学英语四级语法攻略，提升大学英语四级水平。
