Unit 4 Discover useful structures 高中英语人教版选择性必修第三册

Unit4AdversityAndCourage

Period2:Discoverusefulstructures1.教学目标.TomasterthegrammarrulesofthePresentPerfectContinuoustense..ToknowthedifferencesbetweenthePresentPerfectContinuoustenseandthePresentPerfecttense..LearntotranslateandunderstandsentenceswiththePresentPerfectContinuoustensewhentakingexams.2.教学重难点.TomasterthegrammarrulesofthePresentPerfectContinuouslense..ToknowthedifferencesbetweenthePresentPerfectContinuoustenseandthePresentPerfecttense.三、教学过程Step1Lead-in(Observeanddiscover)ThisistheadventurethatIhavebeendreamingof.Wearenowcampedonthericeandwehavebeenmanagingtosurvive,butspringiscoming,andtheicewillsoonbegintomelt.Wehavebeenstrugglingfordays,butthingsonElephantIslandaregoingfrombadtoworse.Step2Presentation.基本结构：“have/hasbeen+现在分词”否认句：主语+have/has+not+been+现在分词…疑问句：Have/Has+主语+been+现在分词…？基本含义：表示动作从过去某一时间开始一直持续到现在，可能刚刚停止，也可能仍在继续。.现在完成进行时的用法1)表示过去发生并持续到现在的动作HowlonghaveyoubeenlearningEnglish?ShehasbeenburningthemidnightoiltoprepareforGRErecently.Tomhasbeenplayingtheonlinegamesformorethantwentyhours.Hisbrotherhasbeenwritingthisnovelsincelastyear.2）表示到目前为止的一段时间内重复进行的活动Ihavebeentellingyounottomaketrouble.Theoldmanhasbeenrepairingcarsforthirtyyears.JackhasbeenpractisingTaiChiformorethanayear.（3）表达某种感情色彩:现在完成进行时有时带有强烈的表扬或厌恶等感情色彩。We'vebeenlookingforwardtooursummervacation.Toomuchhasbeenhappeningtoday.学法点拨以下几类动词不能用于现在完成进行时：①表示感官、感觉：see,hear,smell等；②表示爱憎：love,prefer,mind等;③表示希望、意愿：wish,want,desire等；④表示相信、猜测：believe,think,suppose等;⑤非延续性动词..现在完成进行时与现在完成时的区别（1）现在完成时强调完成和影响，现在完成进行时强调未完成和动作。I'vebeendoingmyhomework.我一直在做家庭作业。（还在做）Evefinishedmyhomework.我已做完家庭作业了。（己完成）（2）现在完成时经常表单个事件，现在完成进行时可表重复事件。Juliahasgonetothelibrary.朱莉娅去图书馆了。（单个事件）Juliahasbeengoingtothelibraryforayear.朱莉娅在一年间经常去图书馆。（重复事件）（3）现在完成时通常只陈述事实，而现在完成进行时含感情色彩。Whathaveyoudone?你做什么了？（仅是问问）Wherehaveyoubeen?Ihavebeenwaitingforyouintherainfortwohours.你去哪里了？我在雨中等了你两个小时。（表示不满）（4）表重复时，现在完成时强调成果，讲次数；现在完成进行时强调持续，不讲次数。Ihavesentthirtye-mailsthismorning.Ihavebeensendinge-mailsthismorning.（5）现在完成进行时不用于被动语态。假设要用，可用现在完成时的被动语态代替。Thehousehasbeenpaintedforamonth.Step3practice(1)翻译句子。①我一■直等了你两个小时。②我等你两个小时了。⑵用所给词的适当形式填空。©There(exist)anoldtemplesincetheMingDynasty.②I(teach)Englishforalmosttwentyyears,andIwillstepinanothernewteachingyear.(3)完成句子①Wetheclassroomalltheafternoon.我们一整个下午一直在清扫教室。②Shelikethat.她一贯是那样工作的。(3)Tvefortwohours,butIhaven,tfinishedit.这本书我已经读了两个小时了，但我还没读完。Theythematterseveraltimesthisyear.他们今年已经屡次讨论那件事了。@MyfatherBeijing,andhe'11bebackthisweek.我的父亲去北京了，这个星期回来。(4)Readeachsituationandrewriteeachasentenceusingthepresentperfectcontinuoustense.Thedogstartedtobarkabouttwohoursago.Ireallyhopeitwillstopsoon.Stevestartedtoplayrugbyattheageofeight.Nowhehasbecomeaprofessionalplayer.③Timmyisholdingatabletennisbatandhisshorthairisdampwithsweat.Helooksalittletiredafterplayingtabletennisfortwohours.@Dianehasn'tgotmuchsleepthisweek.Shelooksterribletoday.Itriedtophoneyouthismorning.ImusthavetriedadozentimesbeforeIcaughtyouhere.Step4summary现在完成进行时表示动作从过去某一时间开始一直延续到现在，这个动作可能刚刚停止，也可能还在进行，常带有一定的感情色彩。其构成为"have/