时间状语从句.pptx

1、时间状语从句讲解及习题,在句子中起时间状语作用的句子称为时间状语从句。时间状语从句可以放在句首，句中和句尾。常用来引导时间状语从句的引导词有： when当时候，while当时候，as当时候，一边，after在之后，before.在之前， since自从，ever since自从，till直到，until直到，as soon as一就，whenever不管什么时候，every time每次，each time每次，next time下次，the moment一就，by the time到，as long as长达，hardlywhen还没来得及.就，once一.就，no sooner.than还

2、没来得及.就,1.When的用法 (1)when意为“当时”，引导时间状语从句，表示主句的动作和从句的动作同时或先后发生。 I feel very happy when you come to see me. 你们来看我时，我感到很高兴。 When youre crossing the street, you must be careful.你过街道时一定要小心。 I was sleeping when someone knocked at the door.当我正在睡觉时，有人敲门。,(2)when 引导的时间状语从句中的动词可以用延续性动词也可以用终止性动词。 He was working

3、 at the table when I went in. 当我进去的时候，他正在桌旁工作。 I will visit my good friend when I have time. 当我有空时，我将去看我的好友。 I worked for a foreign company when I was in Shanghai.当我在上海时，我为一家外企工作。,2.while的用法 while引导时间状语从句时常译为“与.同时，在期间”。while引导的从句常用延续性动词或表示状态的动词。 They rushed in while we were discussing problems.当我们正在

4、讨论问题时，他们冲了进来。 Father was cleaning the car while I was playing computer games.当我正在玩电脑游戏时，爸爸正在清洗汽车。,3.as的用法 as 引导时间状语从句时可以表达“正当，一边一边，随着”等意思。 (1)表示某事一发生，另一事立即发生 As the sun rose the fog disappeared.太阳一出来雾就消散了。 They strolled into the garden as the music ceased.音乐声一停，他们就走进花园。 (2)表示某事发生的过程中，另一事发生 I heard t

5、he murmur of their voices as I crossed the hall.我走过大厅的时候听到他们在嘀咕什么。(两个动作都是一般时态),As he was speaking there was a loud explosion.正在他说话的时候，出现了一声巨响。(从句用进行时态) (3)表示两个动作同时发生 He smiled as he passed.他路过的时候笑了一下。(两个都是短暂动作) As she sang, tears ran down her cheeks. 她一边唱歌，眼泪一边从脸颊躺下。 Helen heard the story as she was

6、hed.海伦一边洗衣服一边讲故事。,He saw that she was smiling as she read.他看到她一边看书一边笑(两个都是延续性动作) We get wiser as we get older.我们随着年龄的增长而变得聪明起来。,难点：when, while, as 的用法 when, while, as 都可引导时间状语从句，意为“在时候”。但具体用法不尽相同。 (1)when用的最广泛，常可代替while与as.与while比较，when所引导的从句既可是延续性的，也可是终止性的。as 在这一点上与when相同，while所引导的从句中，动词只能是延续性的。 Il

7、l phone you again when I get home.我到家后再给你打电话。,The telephone rang while I was taking a bath.我洗澡时电话响了。 (2)当两个表示时间延续的的动作同时发生而又具有对比意味时，用while, 在这样的复合句中，主从句的时态通常是相通的。 Would you look after the children while I do the shopping?我去买东西时你能不能照顾一下孩子？ While she was asleep, thieves broke in and stole her handbag.她熟睡时，小偷破门而入偷走了她的手提包。,(3)表述两个发展变化中的情况时常用as. As time passed, things seemed to get worse.随着时间的推移，情况似乎变得更糟。 As he talked on, he got more and more excited.他越谈就越激动。,练习： 1.The train had just started we arrived at the station. A while B w