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1、UNIT 3 Our Hobbies TOPIC 2 What sweet music!Section C-when引导时间状语从句,一、when可以和延续性动词连用，也可以和短暂性动词连用,Why do you want a new job when youve got such a good one already?（get为短暂性动词） 你已经找到如此好的工作，为何还想再找新的？ When I was doing my homework, my mother came. (was doing 为延续性动词） 当我在作业的时候，我妈妈进来了。,二、when从句的谓语动词可以在主句谓语动作之
2、前、之后或同时发生,1从句动作在主句动作前发生，只用 when。 When he had finished his homework, he took a short rest. （finished先发生）当他完成作业后，他休息了一会儿。,When I got to the airport, the guests had left. （got to后发生）当我赶到飞机场时，客人们已经离开了。,2从句动作和主句动作同时发生，且从句动作为延续性动词时，when，while，as都可使用。 When /While /As we were dancing, a stranger came in. （d
3、ance为延续性动词）当我们跳舞时，一位陌生人走了进来。,When /While /As she was making a phone call, I was writing a letter. （make为延续性动词）当她在打电话时，我正在写信。,3当主句、从句动作同时进行，从句动作的时间概念淡化，而主要表示主句动作发生的背景或条件时，只能用 as。这时，as常表示“随着”；“一边，一边”之意。, As the time went on, the weather got worse.（as表示“随着”之意） 随着时间的转移，天气变得越来越糟。, The atmosphere gets thi
4、nner and thinner as the height increases. 随着高度的增加，大气越来越稀薄。,As years go by, China is getting stronger and richer. 随着时间一年一年过去，中国变得越来越富强了。,The little girls sang as they went. 小姑娘们一边走，一边唱。,4在将来时从句中，常用when，且从句须用一般时代替将来时。 When the manager comes here for a visit next week，Ill talk with him about this. 下周，经
5、理来这参观时，我会和他谈谈此事。,三、when用于表示“一就”的句型中（指过去的事情）。 Sb. had hardly / scarcely done sth when. Hardly / Scarcely had sbdone sth when.,我刚一闭上眼，就有人在敲门了。 I had hardly /scarcely closed my eyes when someone knocked at the door. Hardly / Scarcely had I closed my eyes when someone knocked at the door.,1. We will sta
6、y at home if my aunt _ to visit us tomorrow. A. comes B. come C. will come D. is coming 2. Ill go swimming with you when I _ free tomorrow. A.will be B. shall be C. am D. was,A,C,即时练习：,4. When he got to the station, the train _. A. left B. had left C. leaves D. has left 5.We _ TV when the telephone _. A. watched; was ringing B. were watching; rang C. watch; rings D. are watching; rang,D,B,即时练习：,Thank you!,