1 ppt 课件2Unit 1 My family always go somewhere interesting as soon as the holidays begins2 ppt 课件3 ppt 课件1. 什么时候用when, 什么时候用while?（1 ）. 主句: 短暂动作 + when/while + 从句: 持续动作He fell asleep when /while he was reading. I met him when /while I was taking a walk in the park. （2 ）. 主句: 持续动作 + while + 从句: 持续动作 ( 同时进行) ，且主句动作延续到从句所指的整个时间 Dont talk while youre eating. I kept silent while he was writing. Module 2 Unit 1 知识点（3 ）. 主句: 持续动作 + when + 从句: 短暂动作When he came in, I was listening to the radio. It was rai
