时间状语从句讲与练

1、时间状语从句,讲与练,时间状语从句（分类）,when、 as、 while引导的时间状语从句 before和after引导的时间状语从句 till和until引导的时间状语从句,引导时间状语从句时表示“当的时候” 既可以指时间段也可指时间点， 从句可用延续性动词也可用非延续性动词， 动作既可和主句的动作同时发生 又可在主句的动作之前或之后发生,when,概述,例句,Ill call you when I get there. When the wind blows, all the doors rattle. When I came home my wife was cooking dinne

2、r.,when,概述,引导时间状语从句时表示“当的时候”， 它强调主句的动作与从句的动作同时持续地进行， 用于这一用法时while引导的时间状语从句和主句中的谓语动词必须是延续性动词。 主句的动作发生在从句动作的进行过程中，从句的谓语动词必须是延续性动词, 主句中的谓语动词可以是非延续性动词。,while,例句,I was watching TV while she was singing. I met her while I was at school. Study while you study; play while you play.,while,概述,引导时间状语从句时表示“当时，

3、一边一边”， 侧重表示两个动作同时发生(包括一个主语同时进行两个动作)， 或者一种动作随着另一种动作的变化而变化。 主句从句动词无延续与否的限制。,as,例句,He jumps as he goes along. I saw him as he was getting off the bus. As the wind rose the noise increased.,as,概述,before引导的时间状语从句通常表示主句的动作发生在从句的动作之前。 之后用after.,before,例句,Please turn off the light before you leave the room.

4、 请你在离开房间之前把灯关掉。 You can watch TV after you finish homework. 做完作业之后，你可以看一下电视。,before,until/till 均表示主句的谓语动词（延续性动词）一直延续到 until/till 所表示的时间为止。 1. 肯定句中，二者可以通用。 eg: You may stay here until/till the rain stops. 你可以在这儿呆到雨停。,untill/till,2. 否定句中，表示主句的谓语动词（非延续性动词）直到until所表示的时间才发生。构成句式 not.until。这里不能用 till。 eg:

5、 He didnt go to bed until he had finished his work. 他直到完成工作才去睡觉。,untill/till,3. till 不用于句首，也不可用于强调句。 eg: Until he joined the army, he worked in that factory. 他在那家工厂上班直到参军。 Until he told me, I knew Tom had been ill for a week. 知道他告诉我，我才知道汤姆病了一个星期了。,untill/till,概述,as soon as引导的从句都表示从句的动作一发生，主句的动作随即就发生

6、， 意为“一就”。,as soon as,例句,As soon as he arrives, Ill tell him. 他一到，我就告诉他。,as soon as,昨天直到雨停了，孩子们才离开学校。 The children _ leave school _ the rain stopped yesterday,实战练习,He _ wait until the rain _ Awont；will stop Bwont；stop Cwill；stops Dwill；will stop,实战练习,When all the work _(finish), you may go back home. My brother_ (begin) to learn English when he was eight. Please _(not leave) here until you _(tell) to As soon as he_ (get) there, he will write to us at once.,实战练习,He took out the camera as soon as he _(see) the monster. I often _(go) to see her when she wa