than, as…as…，not so as…，(not) the same as, the+比较级;eg：Light travels fast than sound.
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.
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.
方式状语从句通常由as,,as if, as though，the way, what引导;eg：Always do to the others as you would be done by.
When enter rome do as the romans do .
eg：They completely ignore these facts as if (as though) they never existed. (与事实相反，谓语用虚拟语气。)He looks as if (as though) he had been hit by lighting.
It looks as if the weather may pick up very soon.
(3)the way：可以连接两个句子，表达就像……一样;eg：I should do the job the way my father did.
Many Europeans now apparently view the US. the way many Americans view Mexican as a cheap place to vacation, shop and party.
eg：Air is to man what/as water is to fish.
句型：A is to B what C is to D.
eg：A1 Gore calls global warming an "inconvenient truth," as if merely recognizing it could put us on a path to a solution.
put sb. on a path to a solution：找到解决的办法.