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外研版九年级英语下册《Language in use》Travel PPT免费课件,共49页。Learning Goals通过本课的学习,学生能够:①复习巩固状语从句和不定式的用法②给出学习英语的一些建议Warming UpLet’s first enjoy a beautiful song and you should tell which word appeared most often in the song after listening.if 引导条件状语从句If the hero never comes to you.若英雄不来救美而你无法退场If you need someone you’re feeling blue若你需要个人而你正为此忧伤If you wait for love and you’re alone.若你在企盼爱而你偏独守空房If you call your friends and nobody’s home.若你给朋友打电话却没人在家状语从句(The adverbial clause)一、状语从句的概念和基本类型状语从句是指句子用作状语时,起副词作用的句子。状语从句一般由连词(从属连词)引导,也可以由词组引起。从句位于句首或句中时通常用逗号与主句隔开,位于句尾时可以不用逗号隔开。状语从句根据其作用可分为时间、地点、原因、条件、目的、结果、让步、方式和比较等从句。二、状语从句辨析(一)时间状语从句1.while, as, when(1)while只能用于延续性动词。当从句和主句的谓语动词都为延续性动词,且有对比关系的时候,只能用while。例如:Strike while the iron is hot.趁热打铁。(用于延续性动词)While my wife was reading the newspaper, I was watching TV.当我妻子在看报纸的时候,我在看电视。(表动作同时发生)(2)as可以表示主句和从句的动作同时进行,译为“一边……一边……”;也可以表示“时间的推移,随着”。例如:As time went on, the weather got worse.随着时间的流逝,天气变得越来越糟。(3)when一般用于短暂性动词和延续性动词,且当表示动作先后发生时,只用when,不用while。例如:When he had finished the homework, he took a short rest.他完成作业后,休息了片刻。(表示动作先后)2. before, afterbefore表示主句动作发生在从句动作之前;after表示主句动作发生在从句动作之后。例如:Take care of my baby after I leave.在我离开之后照顾好我的孩子。She worked in Shanghai before she came here.她来这之前在上海工作。注意:before和after 也可以作介词,此时后接名词或动名词。I would like to think it over before deciding .我还是想想再决定吧。3. until与till及not...until / till(1)until, till用于肯定句中,until和till的用法一样,主句动词为延续性动词,表示“直到……为止”。但是位于句首的时候只能用until。例如:I waited for him till / until he came back.我一直等到他回来。Until you told me the news I had no idea of it.我对这个消息一无所知,直到你告诉我。(2)not…until / till用于否定句中,多用until,主句用非延续性动词,表示“直到……才”。例如:I didn’t go to bed until my father came back.直到我父亲回来我才上床睡觉。4. since由since引导的时间状语从句,一般情况下,当从句谓语动词用一般过去时,而主句的谓语动词用现在完成时。Where have you been since I last saw you?自上次我和你见面以后,你到哪里去了?... ... ...关键词:Language in use PPT课件免费下载,Travel PPT下载,.PPTX格式; 本作品中主体文字及图片可替换修改,文字修改可直接点击文本框进行编辑,图片更改可选中图片后单击鼠标右键选择更换图片,也可根据自身需求增加和删除作品中的内容,源文件无水印。如认为该内容涉嫌侵权,可通过邮件提出书面通知,我们将及时处理。