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现在完成时用法一•表示:过去发生的动作对现在造成的影响和结果.•构成:have/has+过去分词•时间状语:already,yet,never,ever,before,just•already和yet的区别表示过去发生的某个动作对现在造成的影响或结果。Haveyoufinishedyourworkyet?Yes,Ihave.I’vejustfinishedit.I’vealreadyfinishedit.No,Ihaven’tfinishedityet.现在完成时谓语动词的构成：助动词have/has(not)+V-ed（P.P.过去分词）•I______________(finish)thecompositionalready.•He___________(learn)Englishforthreeyears.•We/You/They….•She/It….havefinishedhavefinishedhaslearnedhaslearnedCanyoufindoutthesentencesofthepresentperfecttense?1.You’vemissedhim.2.He’sjustleft.3.You’vejustmissedit.4.He’sjustgone.5.I’veonlyjuststarted.6.I’vehadasillymorning.7.I’vejustfollowedyoualloverthecity.时间状语：already-yetever-neverjustonce/twicebefore•I________(do)myhomeworkalready.•He_____________(notfinished)hishomeworkyet.•_______youever______(be)toHaiwaii?•We______never______(see)suchanexcitingmatchbefore.•Mother_____just_______(clean)thehouse.Pleasedon’tcomein.•They_________________(practice)thisdialoguetwice.•I_________(see)thisgirlbefore.havedonehasnotfinishedHavebeenhaveseenhascleanedhavepracticedhaveseenalready和yet的区别yet只用于否定句和疑问句当中,yet表示“已经”,not…yet表示“还没有”1.I’mnotreadyyet.2.Haveyoufinishedyourhomeworkyet?already也表“已经”,强调动作的完成,常与肯定的陈述句连用(可用于疑问句,表示惊讶)1.Ihavealreadyreadthebookfourtimes.2.Haveyoufinishedlunchalready?It’sonly11o’clock!现在完成时用法二◎表示:过去发生的动作,一直延续到现在,甚至有可能继续延续下去.◎时间状语:通常和for,since引导的时间状语连用.◎for和since的区别用法2：表示动作或状态从过去开始一直持续到现在甚至将来Jeffborrowedthebookstwodaysago.Jeffhaskeptthebooksfortwodays.标志时间短语：for+一段时间,since+过去的时间点,theseyears,sofar,inthepast/last…years•We__________(learn)Englishforthreeyears/sincetwoyearsago/since2000.•Mr.Green_________(be)inChinatheseyears.•They____________(write)15songssofar.•Thepopulation____________(grow)moreslowlyinthepasttenyears.havelearnedhasbeenhavewrittenhasgrown选用for和since填空:1.Wehaven’tseeneachother______alongtime.2.HisfatherhasbeenintheParty______10yearsago.3.Thefilmhasbeenon______20minutes.4.MrGreenhasworkedhere______hecametoChina.5.Hisgrandparentshavebeendead______severalyears.6.It’sfiveyears_______wemetlasttime.forsinceforsinceforsince切记用法2的动词仅限于持续动词短暂性动词不能和for,since引导的时间状语连用必须改成延续性动词短暂性动词变延续性动词最常见的有：•buy-----have,borrow-----keep•leave------beaway(from)die------bedead•open-----beopen,close------beclosed•come-----behere/beinbegin/start-----beon•puton-----wear•catchacold------haveacold举例：1.我买了这块手表五年了。2.这位老人已经死了十年了。Ihaveboughtthiswatchforfiveyears/since5yearsago.Ihavehadthiswatchforfiveyears.Theoldmanhasbeendeadfortenyears/since10yearsago.Theoldmanhasdiedfortenyears.√√havebeento,havegoneto的区别havebeento曾经去过(不在那儿)havegoneto已经去了(不在这儿)havebeenin到…来(come的延续性动词)3.他已经回来三天了。4.自从六点钟他就来这儿了。5.我离开家乡已十年了。Hehascomebackfor3days.Hehasbeenbackfor3days/since3daysago.Hehasbeenheresince6o’clock.Hehascomeheresince6o’clock.Ihavelefthometownfor10years.Ihavebeenawayfromhometownfor10years.√√√have/hasgoneto…have/hasgoneto…have/hasbeenin…have/hasbeenin…have/hasbeento…have/hasbeento…1...