一、时间状语
连接词
when, whenever, while, as, before, after, until, till, by the time, as soon as (一……就), hardly…when (一……就), no sooner…than (一……就), the moment, the minute, immediately, directly, instantly
注意：
主句表示将来意义时，从句用一般现在时；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，用在否定句中主句动词是短暂性的。
二、地点状语
连接词：where, wherever
三、原因状语
连接词：because, as, since, now that (既然)
注意：because语气最强；since较弱，表示大家都明了的原因，as次之。
四、条件状语
连接词：if, unless(除非，如果不), once, in case (以防), as long as (只要), on condition that (条件是)
注意：从句中动词时态不可用将来时，常用一般时代替。
五、结果状语
连接词：so…that, such…that
六、目的状语
连接词：so that, in order that, for fear that (唯恐，以免)
注意：so that和in order that后常接may, should, could, would等情态动词。
七、比较状语
连接词：than, as…as, not so / as…as, the more…the more
八、方式状语
连接词：as if, as though, as
注意：as if和as though引导的从句一般用虚拟语气。
九、让步状语
连接词：
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
注意：as在让步状语从句中常用倒装形式；a
