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PresentPerfectPresentPerfectTenseTensePresentperfecttensePresentperfecttense现在完成时构成构成::用法一：用法一：动作发生在过去，对现在有影响。have/has+过去分词1.都表示过去发生的事2.现在完成时强调过去和现在的联系，不能和具体的时间状语连用；3.一般过去时强调过去发生的事或状态与表示过去的具体时间连用（last,ago,yesterday,etc.）presentpastIhavelivedherefortwoyearsIhavelivedherefortwoyearsIlivedthere2yearsagoIlivedthere2yearsago和过去时态的区别及联系：··20072009Eddiewasbornfouryearsago.pastpresentEddiehaslivedwithMilliesincehewasborn.pastpresentEddiehaslivedwithMillieforfouryears.Weusethepresentperfecttensetotalkaboutthingsthatstartedinthepastandcontinuetothepresent.Wealsousethepresentperfecttensetotalkaboutthingsthathappenedinthepastandhaveconnectionwiththepresent.movelivelovelike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/werebeengavegivensawseenmademadeputputcamecomewrotewritteneg.1.Hehadhisbreakfastat6:00Hehashadhisbreakfast.2.Whendidyoucomehere?IwatchedthefootballmatchonTVat9:00.AdverbsoftimeAdverbsoftimebefore,bynow(sofar),once,twice…,just,recentlyyet(否/疑),already(肯),ever,never,allone’slife,in/duringthepast/last5years,ExercisesExercises1.I________(have)lunchalready..2.Hasthetrain_______(arrive),yet?3.Tome____never_______(beto)China.4.Thetwin______just_____(see)myfather.5.Thetwins____(see)myfatherjustnow.havehadarrivedhasbeentohasseensaw用法二：for+段时间since+点时间since+句子（过去时）E.g.Katehaslivedherefor3years.Katehaslivedheresince3yearsago.KatehaslivedheresinceshecametoChina.表示过去某个时间开始的动作或存在的状态，一直持续到现在并可能还将持续下去。动词使用延续性动词。常与for或since引导的时间连用since和for:1)EddiehaslivedwithMilliesince2001.EddiehaslivedwithMilliesince4yearsago.EddiehaslivedwithMilliesincehewasborn.小结:since+时间点（词、词组或句子）2)EddiehaslivedwithMillieforfouryears.小结:for+时间段3)对以上句子划线部分提问:HowlonghasEddielivedwithMillie?1.WehavelearnedEnglish______GradeThreeinprimaryschool.WehavelearnedEnglish_______fiveyears.2.Hehasn’tfeltwell________lastnight.Hasheseenthedoctor?3.Ihavereadthisstorybook_______threedaysago.Ihaven’tfinishedreadingityet.选用since或for填空:sinceforsincesince4.Ithassnowed______twodays.Everythingiscoveredwithsnow.5.Wehavecleanedtheclassroom______halfanhour.6.Wehavestudiedatthisschool____2003.forforsince常见非延续性动词和延续性动词的转变常见非延续性动词和延续性动词的转变arrive/come/gotodiebecomeaborrowLeave/movebuyopenjoinstart/beginfinish/endcatchacoldgetupgettoknowgetoutclosewakeupgotosleepbecomeinterestedinbeinbedeadhavekeepbeaway/beoutbeabein/amemberofbeopenbeonbeoverhaveacoldbeupknowbeoutbeclosedbeawakebeasleep/sleepbeinterestedinExercisesExercisesHisfatherhasdied.(for2years)Thefootballmatchhasbegun.(since9:00a.m)Thetwinshavejoinedthearmy.(sincetheyare18yearsold)MyteacherhasjustleftNanjing.(for3days)Hisfatherhasbeendeadfor2years...