时间状语从句
(1)表示时间的状语从句可以由when，whenever，as，while，before，until，ever since，as soon as等词引导。
As a young man (＝When he was a young man)，he was fond of hunting.他年轻时，喜欢打猎。
When the rain stopped，students rushed out of the classroom.
雨停了，学生们冲出教室。
My mother was cooking while I was doing my homework.
我做作业时母亲在做饭。
