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2016-2017学年高中英语 Module 4 Music Born in America Section 3 Grammar课件 外研版选修7.ppt

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Section Ⅲ Grammar 项目一 时间状语从句 一、时间状语从句的定义 时间状语从句在句中起状语作用,表示时间。时间状语从句表示将来时间时,其谓语动词通常用现在时态。 二、引导时间状语从句的连词 when,while,as,after,before,once,since,till,until,whenever,as long as等。另外表示时间的名词词组及部分副词the minute,the moment,the instant,the day,the week,the year,the first time,any time,next time,every time,each time,the last time,all the time,from the time,by the time,immediately,instantly,directly等也可以引导时间状语从句。 三、时间状语从句的特殊用法 1.表示“一……就……”的引导词的用法 as soon as,immediately,directly,the moment,the minute,no sooner...than...,hardly/scarcely...when...这些从属连词引导的从句都表示从句的动作一发生,主句的动作就随即发生,常译为“一……就……”。 Directly you feel any pains,you must go to see the doctor. 你一感觉不适就得去看医生。 No sooner had I begun to talk than he rang off. 我几乎还未来得及讲话,他就挂断了电话。 2.几个和time构成的短语 every time,each time,(the) next time,anytime,the last time,the first time,by the time等可以起到连词作用,来引导时间状语从句。 I liked this type of car the first time I saw it. 第一眼看到这款汽车时我就喜欢上它了。 Every/Each time I was in trouble,he would come to help me out. 每次有了麻烦,他都会来帮我。 注意: 由by the time引导的时间状语从句 注意时态的变化:一般情况下,如果从句用一般过去时,主句用过去完成时;如果从句用一般现在时,则主句用将来完成时或一般将来时。 By the time you came back,I had finished this task. 到你回来时,我已完成这项工作了。 By the time you come here tomorrow,we will have left for Hong Kong.你明天来这儿的时候,我们将已动身前往香港了。 3.till和until (1)主句谓语动词为延续性动词时,主句和从句都用肯定句式,意为“一直到”,表示主句动作一直延续到until/till从句表示的时间才终止;主句谓语动词为短暂性动词时,主句用否定式,从句用肯定式,意思是“直到……才……”,表示主句动作到until/till从句表示的时间才开始。 We didn’t get home until midnight yesterday. 昨天我们直到半夜才到家。 (2) until 和till意义相同,通常可换用,但在强调结构、倒装句或句首时,一般用until。 It was not until then that I realized my mistake. 直到那时我才意识到自己的错误。 Not until then did I realize my mistake. 直到那时我才意识到自己的错误。 4.before (1)表示“过了多久后才……,动作进行到什么程度才……” The man almost knocked me down before he saw me. 这个人几乎撞倒了我时才看见我。 (2)表示“来不及;尚未……就……” She left the company before I could have a word with her. 我尚未和她说话,她就离开了公司。 (3)表示“不知不觉就……;还没弄清就……” Time passed quickly and three months went by before Aqiao knew it.时间过得很快,阿巧还没弄清三个月就过去了。 (4)用于句型“It was/will be+时间段+before...”表示“过了多久才……” It was
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