新概念英语青少版4A Unit 4ppt课件.pptx

Unit4AnExcitingTrip 1 Anexcitingtrip I vejustreceivedaletterfrommybrotherTim HeisinAustralia He sbeenthereforsixmoths 2 Anexcitingtrip Timisanengineer Heisworkingforabigfirmandhe salreadyvisitedagreatnumberofdifferentplacesinAustralia 3 Anexcitingtrip He sjustboughtanAustraliancarandheisgoingtoAliceSpring AsmalltowninthecenterofAustralia HewillsoonvisitDarwin FromtherehewillflytoPerth Mybrotherhasneverbeenabroadbefore Sohefindsthistripveryexciting 4 5 GuidedConversation Frommybrother InAustralia Forsixmonths He sanengineer Abigfirm Yes hehas AnAustraliancar ToAliceSpring Darwin ToPerth No hewon t 6 PatternPractice Have hasdone现在完成时表示发生在过去的某个时间 具体时间不清楚 并一直持续到现在的动作 注意yet只能用在疑问句和否定句中 句型1HaveyoureceivedTim sletteryet 句型2 Whydon tyoureadthatbook BecauseI vealreadyreadit 句型3He sgonetoAustralia 句型4 Hasthetrainarrived No ithasn tarrivedyet 7 KeyStructures a 现在完成时表示i 动作发生在过去的某个时间 确切的时间并不重要 也不会给出 但影响十分明显 例如Ihavereadtheletter butIdon tunderstandit ii 动作开始于过去 现在仍在继续或刚刚结束 这时经常与for 一段时间或since 时间点一起使用Hehasbeenthereforsixmonths Hehasneverbeenabroadbefore iii 动作刚备完成 例如Ihavejustreceivedaletterfrommybrother 8 KeyStructures b already用在肯定句中 yet用在否定和疑问句中 Hehas already visitedagreatmanyofplaces already Thetrainhasn tarrivedyet 9 KeyStructures c 注意havegone和havebeen区别HehasgonetoAliceSprings 表示他在那里或正在去那里的路上 HehasbeentoAliceSprings 表示他曾经去过那里 但他现在已不再那里 10 KeyStructures Finishtheexercises 11 Reading six disappointed today birthdaycardscards presents postman delivered mother Whathashappenedtothepost stri