时间状语从句就是在复合句中表
示主句动作发生时间的状语从句。 when引导时间状语从句时，意思是“ 当······的时候”。
I'll call you when I get there. 我到那里时就给你打电话。
When I got home, my wife was cooking dinner. 我到家时，我妻子在做晚饭。
2, 主句从句位置问题
when从句放主句前后都可，从句防主句之前需 逗号隔开。
1. We'll start out ____ the teacher comes. A. when B. while C. though D.but 2.----Please remember to say goodbye to Mr.Smith when you ____ tomorrow. ----Sure, I will. A. leave B. will leave C. left D. have left
The boy will be a writer when he grows up. 这个男孩长大时将成为一名作家。
Attention
• 1， 主句从句时态要一致 • 主句过去 从句过去
• When he was 7, he could swim.
• 主将从现 主祈从现 主情从现 When he comes , we will start the meeting. When you are ill, you must see a doctor. Be careful when you cross the street(大街).
whll come here tomorrow. • I will come here at 3:00. • I will come here in the morning.
• I will come here when you are not busy. • 时间状语若为句子，则该句称为时间状语从句。