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GrammarUnit18B现在完成时PresentperfecttenseStructure：have/has+v过去分词(p.p)havebreakfastIhavejusthadmybreakfast.I’mnothungrynowpastparticipleTask1:现在完成时的用法1.Weusethepresentperfecttensetotalkaboutanactionthathappenedinthepastandhasaconnectionwiththepresent.(一、表示动作发生在过去并与现在有联系。)wrotesomewordsontheBbThewordsareontheBbNowPast(Ihavewrittensomewordsontheblackboardalready.)Haveatry:“already”or“yet”1.Hehas________visitedmanyplacesinChina.2.Lilyhashadbreakfast___________.3.Hasshearrived_______?4.Thetrainhasn'tarrived__________.alreadyalreadyyetyet注意already在句中的两种位置.Noticetheword“already”inthetwosentences1.Hehas_________visitedmanyplacesinJapan.2.Thetrainhasn’tarrived_________.3.Hastheplanearrived_________?4.Hasn’thecomeback_________?上一页下一页Tips★already是“已经”之意，用在________________________中。yet用在_________________________________________中，在否定句中有“还”之意。alreadyyetyetyet肯定句(positivesentence)疑问句和否定句(generalquestionsandnegatives)现在完成时的用法(二)IhavebeenateachersinceIleftmycollege(大学).Ibecameateacher.Iamstillateacher.NowPastFutureWeusethepresentperfecttensetotalkaboutanactionthatstartedinthepastandcontinuestothepresent.(表示过去已经开始持续到现在或将来的动作或状态。)Ihavebeenateacherforabout20years.movedherein2008IstilllivehereIhavelivedherefor9years.Ihavelivedheresince2008/9yearsago.IhavelivedheresinceImovedherein2008.常用延续性动词(Itisoftenusedforcontinuousverbs.)Lookandsay.Thepig;swim;threehoursThepighasswumforthreehours.Thepighasswumsincethreehoursago.Lookandsay.Jack;playcomputergames;2daysJackhasplayedcomputergamesfor2days.对划线部分提问(Questiontheunderlinedpart)Jackhasplayedcomputergamessince2daysago.HowlonghasJackplayedcomputergames?since和for:EddiehaslivedwithMilliesince2011.EddiehaslivedwithMilliesince6yearsago.EddiehaslivedwithMilliesincehewasborn.1)Rules:since+时间点（词、词组或句子）EddiehaslivedwithMillieforfouryears.2)rules:for+时间段3)对以上句子划线部分提问:HowlonghasEddielivedwithMillie?timepointperiodoftimeDoyoureallyunderstand?用since或for填空：1.Ihavebeenatthisschool______morethantwoyears.2.Shehasworkedinthefactory_____tenyearsago.3.Mr.Greenhaslivedinthecity______heleftcollege.4.ShehaslearnedEnglish______1999.forsincesincesinceWealsousethepresentperfecttensetotalkabouthowmanytimesanactionhashappenedtillnow.表示某事直到现在已经发生了多次.IhavewatchedtheTVplaymanytimes.现在完成时用法(三)•Weoftenuse:•ever曾经(疑问句，have/has后)•你读过这本书吗？•Haveyoueverreadthisbook?•never从来没有(否定,have/has后)•我从没看过这部电影。•Ihaveneverwatchedthisfilm.“ever”or“never”?—Haveyou______seenthefilm?—No.Ihave_______seenit.evernever选择never,ever填空。Keywordsyeteverneversinceforjustalreadyrecently（1）already“已经”，放在肯定句句中或句末；（2）yet放在疑问句句尾时，表示“已经”；放在否定句句尾时，表示“还(没，不)”常用的时间状语区别Thedifferencesbetweentheusualtemporaladverbials（3）ever“曾经”，用于疑问句或否定句中；（4）never“从来没有”，表示否定句中。（5）just“刚刚”，用于陈述句中；（6）recently“近来”，用于句末。①Ihave____comebackfromthesupermarket.(for,just,since)②Ihave___beentoChengdu.(for,never,yet)③Hehasworkedthere_____heleftschool.(already,just,since)④HehasknownSam_____nineyears.(for,never,since)⑤Haveyou_____riddenahorse?(ever,for,yet)Haveyoureallyunderstood?Completethesentenceswithcorrectwords._Task2:ThePresentPerfectTense(现在完成时态)基本结构(Basicstructure):have/has+P.P(pastparticiple)We_________(live)inJingshasincewewereborn.for14years.havelivedWe____________(study)heresince2015.for2years.havestudied肯定式(positiveform):have/has+p.pnotchangealotLet’shaveatrythestudentsThestudents________________alot.haven’tchanged=havenot否定形式：negativeformLet’spractiseLucyhasfinishedherhomework.(否定句)Lucy__________finishedherhomework.hasnot=hasn’tWorkouttherule只需要在___________后加上_________即可。have或hasnothavenot=haven’thasnot=hasn’t?IhavewatchedtheTVplaymanytimes.HaveyouwatchedtheTVplaymanytimes?Yes,Ihave.No,Ihaven’t.一般疑问句(generalquention)Weaskandanswerquestionsinthepresentperfecttenselikethis:Let’spractiseWehavecleanedtheclassroom.(一般疑问句，并做肯定和否定回答)_____you________theclassroom？Yes,____________.No,_____________.Havecleanedwehavewehaven’t.Let’spractiseLucyhasfinishedherhomework.(一般疑问句，并做肯定和否定回答)_____Lucy________herhomework？Yes,____________.No,_____________.Hasfinishedshehasshehasn’t.ThePresentPerfectTense(现在完成时)一般疑问式:将have/has提前到句首回答:肯定：否定：Yes,…have/has.No,…haven’t/hasn’t.只需把___________提到_____,其余______即可。注意：第____人称变第___人称。have或has句首照抄一二Let’stry!1.Shehasalreadycleanedthekitchen.(改为否定句)→She__________cleanedthekitchen___________.2.TheyhavevisitedsomeinterestingplacesinChina.(一般疑问句)→________they_________________interestingplacesinChina?3.Thepoordoghasdied.(改为一般疑问句并作否定回答）→_______thepoordog______?-No,it__________.4.IhaveeverbeentotheGreatWall.(改为否定句)→I________________beentotheGreatWall.5.Theyhavestudiedheresincetheymovedtothecity.(对划线部分提问)→______________________they_________here?hasn’tyetHavevisitedanyHasdiedhasn’thaveneverHowlonghavestudied过去分词（P.P.）lovelikeRegularverbs:过去式和过去分词的构成:visitrepairwatchvisitedvisitedrepairedrepairedwatchedwatchedlovedlovedlikedlikedverb＋ed(directlyadd“ed”)以不发音的e结尾＋d(withunpronounceable“e”,add“d”)mopplanmoppedmoppedplannedplanned注:以一个辅音字母结尾的重读闭音节词,双写最后一个辅音字母＋ed(Astressed,clousedsyllabewithaconsonant,doublewritethelastconsonantletterandadd”ed”双写＋ed(doublewrite“ed”studyhurrystudie