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）...
责任编辑：jiaxin
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