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8BUnit1PastandPresentGrammarLearningaims:1.Masterthestructureandbasicusageofpresentperfecttense(PPT).（掌握现在完成时的基本结构、用法。）2.Learntherulesofformingthepastparticipleofverbs.（学习动词的过去分词变化规则。）3.LearnsometimeexpressionsusuallyusedinPPT.（学习常用在现在完成时里的时间表达方式。）1.HowlonghasMr.ChenlivedinSunshineTown?2.Whathasthegovernmentdonetopartofthetowncenter?3.WhydoesMr.Chenthinkitisimpossibletoseehisoldfriendsasoftenasbefore?Step1:Lead-inAskandanswerHehaslivedtheresincehewasborn.Thegovernmenthasturnedpartofthetowncenterintoanewpark.Becausehisfriendshavemovedaway.Pre–task:LearnontheirownandanswerWhendoweusepresentperfecttense?Weusethepresentperfecttensetotalkaboutanactionthatstartedinthepastandcontinuestothepresent.表示过去开始，现在还在继续的动作。Weusethepresentperfecttensetotalkaboutanactionthathappenedinthepastandhasaconnectionwiththepresent.表示过去发生的或已完成的动作对现在造成的影响或结果。PastpresentEddiehaseatenmyfood.EddieatethefoodandnowHobohasnothingtoeat.Wealsousethepresentperfecttensetotalkabouthowmanytimesanactionhashappenedtillnow.谈论动作已经发生了很多次。Ihavealreadyreadthisbookmanytimes.Weusethesimplepasttensetotalkaboutwhathappenedatadefinitetimeinthepast.（一般过去时谈论在过去的特定时间发生的事）Step3:While–taskTask1:GroupworkMakeaconclusionaboutthebasicstructureofPPTSubject(主语)have/has+(not)（助动词）pastparticiple(过去分词)I/You/We/Theyhave(not)moved.He/She/Ithas(not)moved.Have/Has+主语+动词的过去分词HaveI/you/we/theymoved?Hashe/she/itYes，I/you/we/theyhave.he/she/ithas.No，I/you/we/theyhave.not/haven’t.he/she/ithasnot/hasn’t.一般疑问句AdverbsoftimeAdverbsoftimealready:肯定句，表示已经发生ever:疑问句，表示“曾经”for:肯定句/疑问句/否定句，表示一段时间just:肯定句，表示“刚刚”never:否定句，表示“从不”recently:肯定句/否定句/疑问句，表示“最近”since:肯定句/否定句/疑问句，表示“自---以后”yet:疑问句/否定句，表示“已经”或者“还没有”ExercisesExercises1.I________(have)lunchalready..2.Hasthetrain_______(arrive),yet?3.Tome____never_______(beto)China.4.Thetwin______just_____(see)myfather.5.Thetwins____(see)myfatherjustnow.havehadarrivedhasbeentohasseensaw1Haveyoudoneyourhomework_____?(for,just,yet)2Ihave______beentoChengdu.(for,never,yet)3Hehasworkedthere_____heleftschool.(already,just,since)4ShehasknownSam______nineyears.(for,never,since)5Haveyou_______riddenahorse?(ever,for,yet)yetneversinceforever6Theyhave_____arrived.(ever,just,yet)7Hehas_______washedthedishes(already,ever)8Wehavenotcompletedtheproject____.(already,for,yet)justyetalreadyFormingthepastparticipleofverbsMostverbs+edwash→washedVerbsendingine+dlive→livedVerbsendinginaconsonant+y-y+iedstudy→studiedShortverbsendinginavowel+aconsonantdoubletheconsonant+edstop→stoppedStep3:While–taskTask2:Learntherulesmovelivelovelike写出下列动词的过去式和过去分词:visitrepairwatchfinishvisitedvisitedrepairedrepairedwatchedwatchedfinishedfinishedmovedmovedlivedlivedlovedlovedlikedlikedverb＋ed以e结尾＋d写出下列动词的过去式和过去分词:stopmoptrapplanstoppedstoppedmoppedmoppedtrappedtrappedplannedplanned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双写＋edstudyhurrystudiedstudiedhurriedhurried去y＋ied注:以辅音字母加y结尾的词,去y＋ied.写出下列动词的过去式和过去分词:begiveseemakeputcomewritewas/werebeengavegivensawseenmademadeputputca...