英语人教版八年级下册现在完成时精品课件

PresentPerfectTensePresentperfecttense现在完成时表示过去发生的某一动作对现在造成的影响或产生的结果.现在完成时这一时态强调是过去动作与现在的联系,也就是强调现在的影响和结果.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.）presentpastIhavelivedherefortwoyearsIlivedthere2yearsago常用于现在完成时的时间副词,介词:already(已经):用于肯定句yet(已经):用于否定句一般疑问(句末）just(谓语动词之前)（刚刚）,ever(曾经)疑问句)never(从不)Ihaveneverseenhim.before(以前)Haveyouseenthefilmbefore?in/duringthepastseveraldays/weeks/years(在过去的…)recently(最近)Ihavenotwrittentomyparentsrecently.sofarbynow(到目前为止)Sofarshehaslearned5Englishsongs.bynow(sofar),uptonow(到目前为止)allone’slife,once,twice…,thismorning/month/year(今天早上/这个月/今年)Exercises1.I________(have)lunchalready.2.Hasthetrain_______(arrive),yet?3.Tome____never_______(beto)China.4.Thetwin______just_____(see)myfather.5.Thetwins____(see)myfatherjustnow.6.Manytallbuildings____________(build)inthepast5years.havehadarrivedhasbeentohasseensawhavebeenbuilt用法二：表示过去已经开始，持续到现在的动作或状态，也可以表示一直持续到现在并可能还将持续下去。A动词使用延续性动词。B和表时间段的时间状语连用。常与for或since引导的时间连用sofar,upto/tillnow,inthelast/past+一段时间，allone’slife,bynow,thesedays、fortwoyears、since1984、sincehecamehereIhaven’tseenherthesedays.ShehaslearntEnglishfor3years/since3yearsago.Theyhavelivedheresince1990.WhathashappenedtotheUSAinthelast350years?注意：(1)since＋一段时间＋ago＝for＋时间段;sincetwoweeksago=fortwoweeks;Ihavekeptthelibrarybookforaweek.=Ihavekeptthelibrarybooksinceaweekago.(2)since+时间点＝for＋时间段since2000=for７years(3)since+从句(常用一般过去时)TheGreenshavelivedinBeijingsincetheymovedtoBeijingfromParis(4)Itis/hasbeen+一段时间+since从句.自从某事发生已有一段时间了.Itis/hasbeentwoyearssincemybrotherjoinedthearmy.for和since的运用for“经历(时间段)”since“自从…以来”for＋时间段since＋时间段＋agosince＋时间点since＋从句1.Hehasstayedherefor3hours.2.Hehasstayedheresince3hoursago.3.Hehasstayedheresince3o’clock.4.HehastaughtEnglishsincehecamehere.练一练：用for和since填空。______threehours______threeo’clock______twodays______yesterdayafternoon______Icamehere______lastSunday_______aweek_______alongtime_______1997______twoweeks_______threeyearsago_______lastmonthforsinceforsincesincesinceforforsinceforsincesince用for或since填空。1.JillhasbeeninIreland________Monday.2.JillhasbeeninIreland__________threedays.3.MyaunthaslivedinAustralia_______15days.4.Margaretisinheroffice.Shehasbeenthere_____7o'clock.5.Indiahasbeenanindependentcountry________1974.6.Thebusislate.We'vebeenwaiting________20minutes.7.Nobodylivesinthosehouses.Theyhavebeenemptymanyyears.8.Mikehasbeenill________alongtime.Hehasbeeninhospital________October9.It’stenyears______wemeteachotherlasttime.10.HehastaughtEnglish_______25years.11.TheGreenshavelivedonthefarm______1990.12.Theyhavebeenpracticingtheguitar_______twohours.13.－Howlonghaveyoubeenareporter?－_____8yearsago.14.Ihaven’tgoneforawalkinthepark________alongtime.15.He’sbeencollectingstamps_______hewasinprimaryschool.16.Peterhasbeentosummercamp________3times.注意点一:since的用法1.+具体的过去时间since2008sincesincelastSunday+…agosincetwoyearsago+句子(过去时)2.Itis/hasbeen+一段时间+since从句.(自从某事发生已有一段时间了.)Itis/hasbeentwoyearssincemybrotherjoinedthearmy.实义动词分为:1)瞬间动词2)延续动词瞬间动词joinbegin/startborrowfinish/endarrive/comeleave注意:瞬间动词不能和时间段连用.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/sleepbeinterestedin巧记瞬间性动词的转换“开始离去借来还，出生入死买到家，穿衣入睡要感冒，开开关关变结束。”,结束性动词转换为以下延续性动词或者表示可以延续的状态的短语①arriveat/insp/getto/reachsp/come/go/movetosp→beinsp/atschool/athome/onthefarm/behere/bethereHegottoBeijingfiveminutesago.HeBeijingfor.2)ImovedtotheUSAin2008.ItheUSAsince.3)Iwenthomeyesterday.Ihomefor.4)Theycameherelastweek.They___________heresince_____________.②cometo/gobackto/returnto→bebacktogoout→beoutHecameouttwoyearsago.He______________for____________.2)WereturntoBeijingyesterday.We_______________toBeijingsince__________.③become→beIbecameateacherin2000.I__________ateacherfor___________.2)Theriverbecamedirtylastyear.Theriver_______dirtyfor_________.④close→beclosedopen→beopenTheshopclosedtwohoursago.Theshop_________for________.2)Thedooropenedatsixinthemorning.Thedoor_____________forsixhours.⑤getup→beup;die→bedead;leavesp.→beawayfromsp.fallasleep/gettotsleep→beasleep;finish/end→beover;marry→bemarried;1)Igotuptwohoursago.I_____________________since_______________.2)HeleftShanghaijustnow.He__________________________Shanghaiforfiveminutes.3)Mygrandpadiedin2002.Mygrandpa__________________for_______________.4)Themeetingfinishedatsix.Themeeting____________________forsixhours.5)Igottosleeptwohoursago.I________________since__________________.6)Theymarriedin1990.They___________________________since_________.⑥start/begintodosth.→dosth.;begin→beon1)Ibegantoteachatthisschoolin1995.I________atthisschoolsince____.2)Thefilmbegantwominutesago.Thefilm____________for________.⑦borrow→keep;lose→nothave;buy→have;puton→wearcatch/getacold→haveacold;gettoknow→know1)Theyborroweditlastweek.They__________itsince_____________.2)Iboug