时间状语从句的引导词有：when、as、while、as soon as、before、after、since、till、until、whenever 无论何时、once、the first time、instantly、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）
给几个例句加深印象
While they were talking ， the bell rang.
Father often reads until (till) late at night.爸爸经常看书到深夜。
As you leave，please take out the garbage.
你离开的时候，请你把垃圾带出去。
I will go to the company as soon as I have drunk my coffee.
我一喝完咖啡就去学校。
