选择性必修 第二册Unit 3 Food and Culture课前预习ppt课件

这是一份选择性必修 第二册Unit 3 Food and Culture课前预习ppt课件，共19页。

▶Had she finished writing the cmpsitin by 10:00 this mrning?今天上午10点之前,她已经写完作文了吗?▶Hw lng had yu been at the bus stp when a bus finally came? 当公共汽车终于来的时候,你在车站已等了多长时间?
【探究总结】1. 概念:表示__________以前已经发生或完成了的动作,对过去的某一点造成的某种影响或结果,用来指在另一个过去行动之前就已经完成了的事件。 2. (1)肯定句结构:主语+__________+其他. (2)否定句结构:主语+__________+其他. (3)一般疑问句结构:________+主语+过去分词+其他? (4)特殊疑问句结构:________+had+主语+过去分词+其他? 
答案: 1. 过去某一时间或动作 2. (1)had+过去分词(2)had+nt+过去分词　(3)Had　(4)疑问词
现在完成时的动作须在现在之前完成,过去完成时的动作须在过去某一时间之前完成,也就是说动作发生在“过去的过去”。
二、过去完成时的用法【观察思考】 ▶By nine ’clck last night, we had gt 200 pictures frm the spaceship. 到昨晚9点,我们已经收到从宇宙飞船发来的200张图片。▶I heard that he had made an imprtant discvery.我听说他有一个重要的发现。▶After he had finished his hmewrk, he watched TV. 完成作业后他才看电视的。
▶He had intended that he wuld cme t see yu himself, but he was t busy.他本来打算亲自来看你,但他太忙了。▶It was the third time she had been ut with him.这是她第三次和他外出。▶I had n sner/hardly reached hme than/when it began t rain. 我刚到家就开始下雨了。
【探究总结】(1)过去完成时表示过去的过去。(2)过去完成时可以用于______从句中(特别是在间接引语中)。 (3)过去完成时可以用于______从句中。 (4)过去完成时可以用于hpe、 intend、 mean、 think等动词,表示______。 (5)过去完成时可用于某些固定句型。
答案: (2)宾语　(3)状语　(4)未曾实现的愿望
【应用实践】 用所给词的适当形式填空。①I was very sad at his death. We ______ (be) gd friends since ur childhd.  ②She said that she ______ (see) the film befre.  ③I ______ (intend) that I wuld meet yu at the airprt, but I gt up late.  ④Befre we ______ (finish) ur meals, he rdered us back t wrk.  ⑤It was the first time that I ______ (chat) nline in English. 
答案: ①had been　②had seen ③had intended　④had finished ⑤had chatted
三、过去完成时与其他时态的区别(一)过去完成时与一般过去时的区别【观察思考】 ▶They had arrived at the statin by ten yesterday.昨天10点之前他们已到达车站。▶They arrived at the statin at ten yesterday.昨天10点他们到达了车站。
▶She was very happy. Her whle family were pleased with her, t. She had just wn first prize in the cmpsitin cmpetitin. 她很高兴。她的所有家人对她也很满意。在作文比赛中她刚拿了一等奖。▶He entered the rm, turned n the light and read an evening paper. 他走进房间,打开灯,读起晚报来。
【探究总结】(1)时间状语不同:过去完成时在时间上强调“过去的过去”;而一般过去时只强调_______。 (2)在没有明确的过去时间状语作标志时,谓语动词动作发生的时间先后须依据上下文来判断:先发生的用_______时,后发生的则用_______时。 (3)当两个或两个以上接连发生的动作用_______或but连接时,按时间顺序,只需用一般过去时来代替过去完成时。 
答案: (1)过去某一特定时间 (2)过去完成　一般过去　(3)and
【应用实践】用所给词的适当形式填空。①I wanted t reward the ld wman fr the truble I ______ (cause) her. But she refused.  ②Years ag, when I was a pr artist trying t sell my paintings in lcal galleries, I ______ (live) in the heart f a city. ③His wrds tuched the girls and sn they ______ (jin) him.  
答案: ①had caused　②lived　③jined
(二)过去完成时与现在完成时的区别【观察思考】 ▶She had been ill fr a week befre she came back.在回来之前,她已经生病一周了。▶She has been ill fr a week. 她已经生病一周了。【探究总结】现在完成时表示的是延续到现在或同现在有关的动作,句中不可有表示________的状语;而过去完成时表示的是过去某时之前已经完成或延续到过去某时的动作,句中可有表示________的状语。 
答案: 过去特定时间;过去特定时间
【应用实践】 用所给词的适当形式填空。①By the time I gt up, my sister ______ (wash) all the clthes. ②In recent years the Saturday befre Christmas ______ (see) the biggest shpping crwds.　 ③She said that she ______ (learn) English fr years since she ______ (cme) t ur schl. 
答案: ①had washed　②has seen ③had learned　came
Ⅱ. 过去完成时的被动语态一、过去完成时的被动语态的构成【观察思考】 ▶All the film tickets had been sld ut when I gt t the cinema. 当我到电影院的时候,所有的电影票都卖完了。▶He said the wallet hadn’t been wrapped up in newspaper yet. 他说钱包还没被报纸包起来。▶Had the teaching building been cmpleted yet befre he came here? 他来这里之前教学楼已经完工了吗?▶By the end f the trnad, hw many peple had been killed? 龙卷风结束时,有多少人丧生?
答案: (1)had+been+过去分词(2)had+nt+been+过去分词　(3)Had　(4)疑问词
【探究总结】(1)肯定句结构:主语+__________+其他. (2)否定句结构:主语+__________+其他. (3)一般疑问句结构:______+主语+been+过去分词+其他? (4)特殊疑问句结构:______+had+主语+been+过去分词+其他? 
二、过去完成时的被动语态的用法【观察思考】 ▶By the time he gt t the schl, the first perid had been finished. 他到学校时,第一节课已经结束了。▶The classrm hadn’t been cleaned befre the teacher came. 老师来之前教室还没有打扫过。▶They said the prductin csts had been reduced.他们说生产成本已经降低了。▶As the assignment had been dne, he went n t search the Internet. 作业完成后,他继续上网。
【探究总结】(1)过去完成时的被动语态用于表示过去某一时间以前已经完成的动作,且主语和谓语动词之间为______关系,常与by、 befre等引导的时间状语连用。 (2)在 tld、 said、 knew、 heard、 thught等及物动词之后的宾语从句中,从句谓语动词先于主句谓语动词发生,且表示过去某一______动作时,从句用过去完成时的被动语态。 (3)根据句意可以判断出动作先发生且主语和谓语动词之间为______关系,用过去完成时的被动语态。 
答案: (1)动宾　(2)被动　(3)动宾