新概念英语第三册答案及解析-新概念英语第三册语法解析：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 ...
　　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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