when(当/突然间), while, as(随着/一边…一边);before, after; as soon as,since; till/until(注意倒装和强调结构)
the moment/the second/the minute/the instant=immediately/instantly/directly(一…就…);every time/each time=whenever每当；the first time; hardly/scarcely/seldom…when, no sooner…than
because(语气最强，可被强调，对why回答); since=now that(既然);as(由于);seeing (that)/considering (that)/given (that)(考虑到);for(不置句首，表推测性原因) ;in that(原因在于); not that…but that…(不是因为，而是因为)
if, unless=if not(除非); once(一旦), in case(如果), on condition that(条件是), as(so) long as只要， as far as, suppose (that)=supposing(that)=provided (that)=providing (that)=assuming (that)=if假如。
though, although, even though/even if(即使)/while(在句首解释为尽管，句中为然而，表示对比的转折)
名词(形容词、副词)+as/though +主语+谓语”结构(修辞性倒装): young as he was//boy as he was/a young boy as he was…whether…or (not)…;注意区分whatever(修饰名词)和however(修饰形容词或副词)
whoever/whomever/whatever/whichever/whenever/wherever/however=no matter who/whom/what/which/when/where/howso…that/so that;such…that/such that; that;注意区分such和so的用法区别(such a adj. n.= so adj.
a n.)等sofast did he run that i couldn’t catch up with him.= he ran so fast that i couldn’t catch up with him.
(部分倒装)
so that; in order that; lest=in case=for fear that(惟恐，万一，以免),后面多数用should +动词原形；
此外， so that/in order that目的状语从句多在从句里面出现can/could/may/might这样的情态动词，这点与结果状语从句不同。than, as…as, (not) as / so…as
越…,越…”结构：the +比较级+主语+谓语，the +比较级+主语+谓语。(多在后半句**现一般将来时态)倍数表达法：
倍数twice (three times) as +形容词原级+(名词)+as
倍数twice (three times) +形容词比较级+ than,倍数twice (three times) the size / length / width / height / depth / weight of
as(如同，按照); as if=as though(好像，仿佛); just) as…so…(正如…也…);a is to bwhatc is to d; the way (in which/that/不填)where, wherever(无论何地); where there is a will, there is a way.有志者事竟成。
注意区别和定语从句的用法差异： i will gotothe place wherei am needed most. =i will gowherei am needed most.
时间状语从句。
原因状语从句。
条件状语从句。
让步状语从句。
结果状语从句。
目的状语从句。
比较比例状语从句。
方式方法状语从句地点状语从句。
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