状语从句包括原因状语从句、结果状语从句、时间状语从句、条件状语从句、让步状语从句、目的状语从句和比较状语从句。

　　① 原因：because, since, now that(既然)as, for, this reason....

　　② 结果：so that, so, therefore, consequently, so as to, as a result ....

　　③ 时间：after, before, when, while, as, until, as soon as, since, by the time, once, lately, presently, shortly after, currently, at present, nowadays ...

　　④ 条件：if, only if., once, unless, in the event (that), in case (that), provided that, on the condition that, etc.

　　⑤ 让步：though, although, even though(if), no matter what / how / when→ whatever / however / whenever ....

　　⑥ 目的：in order that, in order to, to,

　　⑦ 比较：than, as ... as, by comparison(相比较)，by contrast(相对照)....

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