引导状语从句的从属连词：
1、时间状语从句
常用引导词：when、as、while、as soon as、before、after、since、till、until
特殊引导词：the minute、the moment、the second、every time、the day、immediately、directly、no sooner?than（一??就??）、hardly?when（刚一??就??）、scarcely?when（几乎没有?的时候）
2、地点状语从句
常用引导词：where
特殊引导词：wherever、anywhere、everywhere
3、原因状语从句
常用引导词：because、since、as、for
特殊引导词：seeing that、now that、in that、considering that、given that
4、结果状语从句
常用引导词：so?that、such?that
特殊引导词：such that、to the degree that、to the extent that、to such a degree that
5、目的状语从句
常用引导词：so that、such that
特殊引导词：to the degree that、to the extent that、to such a degree that、in order that
6、条件状语从句
常用引导词：if、unless、whether（whether?or not）
特殊引导词：as/so long as、only if、providing/provide that、supposing that、in case that、on condition that
7、让步状语从句
常用引导词：though、although、even if、even though
特殊引导词：as（用在让步状语从句中必须要倒装）、while（一般用在句首）、no matter?、in spite of the fact that、whatever、whoever、wherever、whenever、however、whichever