No sooner...than Hardly...when Scarcely..when 以上三个句型都表示“一...就...", 用于表述过去的事情,使用时须注意： 时间状语从句放中间,用过去完成时 主句放后面,用一般过去式. 特别注意;时间状语从句要部分倒装.Hardly had they gone out of the classroom when it began to rain. No sooner had he arrived there than he fell ill. Scarcely had she fallen asleep when a knock at the door awaked him. as soon as 多用来表示现在或将来的事情. The meeting will begin as soon as the teacher comes in. 这时,as son as 引导时间状语从句
