种类 连接词 注意点

时间状语 when, whenever, while, as, before, after, until, till, by the time, as soon as, hardly…when, no sooner…than, the moment, the minute, immediately, directly, instantly 主句表示将来意义时，从句须用一般现在时；while引导的从句中动词一般是延续性的；until用在肯定句中主句动词是延续性的，而否定句中主句动词为短暂性的。

地点状语 where, wherever

原因状语 because, as, since, now that because语气强，since较弱，表示大家都明了的原因，as又次之。

条件状语 if, unless, once, in case, as long as, on condition that 从句中动词时态不可用将来时，常用一般时代替

目的状语 so that, in order that, for fear that so that和in order that后常接may, should, could, would等情态动词

结果状语 so…that, such…that

比较状语 than, as…as, not so/as…as, the more…the more

方式状语 as if, as though, as as if 和as though引导的从句一般用虚拟语气。

让步状语 though, although, even if, even though, as, no matter what, whatever, no matter who, whoever, no matter which, whichever, no matter how, however, no matter when, whenever as在让步状语从句中常用倒装形式；although和though用正常语序，可和yet连用，但不可和but连用