初中英语语法知识总结:从句答:2. 地点状语从句: 一般用where or wherever 引导 3. 条件状语从句:真实条件从句:if, unless, so long as, provided that, supposing that, on condition that, in the event that, in case that etc 4. 原因状语从句: 从属连词有because, as ,since, for, now, that, in that, seeing that...