Section ⅣModule 3语法讲座写作讲座考点精析专题练习佳作观摩技法指导专题练习时间状语从句和过去完成时一、时间状语从句 时间状语从句用来说明主句谓语动词发生的时间,由连词引导,本模块主要学习when, while, as及by the time引导的时间状语从句。1.when可以和延续性动词连用,也可以和短暂性动词连用,主句和从句中的动作或事情可以同时发生,也可以先后发生。Sorry, I was out when you called me.对不起,你打电话时我刚好外出了。When he had finished his homework, he took a short re..