新外研版九年级上册精品课件2-Unit-3.pptVIP

Module 2 Public holidays Unit 3 Language in use ______we’re staying with our friends, we’re going to spend one day in Qingdao． ______ we begin dinner, my father gives thanks for food． ______ it is all over, everyone helps wash the dishes． And my family always go somewhere interesting _____________the holiday begins. We have celebrated the festival ______ the first pioneers from England arrived in America. _______ they landed, their first winter was worse than any English winter. after before while as soon as when since While Before When as soon as since After 一、什么是状语从句？ 用表示时间的连词引导一个句子作_______,这个句子就是时间状语从句。 语法探究 状语 引导时间状语从句的词 有 1.由when 连接的时间状语从句 when表示“当……时候”，主句的动作和从句的动作可以同时发生，也可以先后发生 。 我父亲到家时,我在做作业。 二、常见的时间状语从句 when，before，after， until， as soon as，while，since 等 I was doing my homework when my father reached home. 2.由before连接的时间状语从句 before表示“在……之前”表示主句的动作发生在从 句的动作之前。 他去北京前在这里学习。 3. 由after连接的时间状语从句 after表示“在……之后”表示主句的动作发生在从句的动作之后。他变富有后便想出名。 He studied here before he went to Beijing. He wants to be famous after he becomes rich． 4. 由until连接的时间状语从句 until 表示“直到” （从句常在主句后）, till是口语体，可以代替until。当用not...until...引导一个时间状语从句时一般意为“直到……才……”。 他们直到打扫完教室后才回家。 他直到九点才睡觉。 They didn’t go back home until they finished cleaning their classroom. He slept until it was nine o’clock（时刻）. 5. 由as soon as连接的时间状语从句 as soon as表示 “一…… 就……”，指从句的动作一发生，主句的动作随即发生，强调动作紧密相连。 我经常一回家就做作业。 I often do my homework as soon as I get home. 6. 由while连接的时间状语从句While 表示“当……的时候”，强调主句和从句中动作同时发生，从句的谓语动词必须是延续性动词。 他在读杂志而我在写电子邮件。 He was reading a magazine while I was writing a e-mail. when表示一个动作紧接另一个动作发生或表示一个动作发生时另一个动作正在发生; as表示两个动作同时发生,但持续时间较短; while表示两个动作同时发生,持续时间较长,它引导的从句中的谓语动词须用延续性动词。 7. 由since连接的时间状语从句 since表示“自从……以来” ，从句中的动词一般用一般过去时， 主句中的动词一般用现在完成时。 汤姆自从5岁时就住在上海了。 Tom has lived in Shanghai since he was five years old. My mother was cooking supper ______I reached home. 我到家时,母亲在做晚饭。I saw him _____he was getting off the train. 他一下火车，我就看见他了。________ he was cooking supper,