英语时间状语从句重点讲解及专练.pptVIP

* * 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 had walked 20 miles when it started to rain. as, while, when 用法总结 都可以引导时间状语，且意思为“当…的时候”但as和 while常强调两个动作同时发生。当强调两个动作时间 先后时只能用when。 2. when还可做并列连词,意为“那时,这时”,相当于and at this/that time。且还可用于“hardly/scarcely…when” 结构中，意为“刚…就…”。 3. while 有时表示转折或引导让步状语，意为“然而”或 “尽管”。 4. as 用法很多，引导时间状语时有时意为“一边…一边…” 或“随着”。 也可做关系代词用与定语从句中，还可意为 “尽管”“因为”“按照”等，引导让步、原因、方式等 状语从句。 Grammar 2: past perfect tense 过去的两个动作，如果一个动作发生在另一个动作之前，发生在前的就用过去完成时，即“过去的过去”。 eg. When he reached the shop, it had already closed. 1. 在by,by the end of,by the time 后接某一表示过去的时间时。 He had copied the report three times by ten last night. By the end of last Friday, the project had already been completed. We had hoped to catch the 8:00 bus, but found it gone. 3. no sooner…than.., hardly/ scarcely…when..中，前面用完成时，表示“刚…就…” / “一….就….” They had hardly been seated when the bus started. I had no sooner finished the work than the light went out. I had scarcely closed the window when the storm came. I had thought