高考英语--时间状语从句(共14张PPT)

Grammar: adverbial clause of time 时间状语从句。 I.when, while , as 可引导 When I was walking down the street, I came across an old friend of mine. While he was in prison , he wrote his first novel. 如果主句表示的是短暂动作，从句用进行时或延续性动作状态时,when,while,as可互换。 II. 区别 1. as多用于口语中，引导持续性动作，侧重于两个动作同时发生,有“当… 的时候”，“一边…一边…”或表示“随着”的含义, eg. He hurried home, looking behind as he went. As time went on, Einstein’s theory proved to be correct. As he grew older, he began to go deaf. 2. while常引导延续性动作，表示的是一段时间,不是一点时间,强调动作同时发生，相当于during the time. Please don’t talk so loud while others are talking. 3. when 强调“特定时间”, 从句动作发生与主句动作之前时用when，不可用while和as。 while还有对比的含义,有时也表示“尽管”，引导让步状语 He likes pop music,while I am fond of folk music. I can have a rest when I have finished my work. All the lights went out when the clock struck twelve. when还可做并列连词,意为“那时,这时”,相当于and at this/that time We are about to set off on our way when it suddenly began to rain. I was walking on the street when I saw a tailor’s shop. I