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1、现在完成时的讲解和练习一现在完成时的构成:主语+have/has+过去分词(过去分词:规则动词的过去分词构成与动词过去式相同;不规则动词需要特殊记忆。－略)()1.IEnghishinthisschoolsince1999(A)taught(B)havetaught(C)tea(D)wouldteach()2.Lileithepenforfiveyears(A)hashad(B)bought(C)havehad(D)havebought()3.Katehergrandmother'sphotobefore(A)haven'tseen(B)haveseen(C)see(D)hasn't
2、seen二、否定式:主语+haven’t/hasn’t+过去分词。 疑问式:Have/Has+主语+过去分词? 简略答语:Yes,主语+have/has.(肯定)No,主语+haven’t/hasn’t.(否定)().Hefinishedhishomework.yet(A)doesn’t(B)haven’t(C)hasn’t(D)doesn’thave三现在完成时的含义之一表示过去发生或已经完成的动作对现在造成的影响或结果，常与never/ever，just，already/yet，before,sofar等连用。这些标志词可以表达这种含义★以already,just和ye
3、t为标志already,just和yet表示到现在为止动作或状态已经、刚刚或还没有发生。Hehasalreadygotherhelp.Hehasjustseenthefilm.Hehasn’tcomebackyet。★以动作发生的次数为标志 若某一动作到现在为止已经发生了若干次,则要使用现在完成时。 HesayshehasbeentotheUSAthreetimes.()1.—HaveyoulearnedEnglish?—Yes,I'velearnedalot.(A)never,ever(B)ever,never(C)ever,already(D)already.ev
4、er()2.—Haveyoufinishedyourhomework?—Yes,I'vedonethat(A)yet,already(B)already,yet(C)ever,never(D)still,just四、现在完成时含义之二表示过去已经开始,一直延续到现在的动作或状态。常与for,since,howlong,,thesedays等连用。⑴Since+过去点的时间（since短语或从句表示过去的动作延续至今，since之后的时间为一点）Mr.Smithhasworkedheresince1984.He’slearnedabout5,000Englishwordssincehe
5、wenttocollege.⑵for+一段时间（数词+量词），（for短语表示动作延续多长时间，for的宾语为时间段）。此划线部分用howlong提问。用since和for填空1)______twoyears2)_______twoyearsago3)_______lastmonth4)_____lunchtime5)______shelefthere()1.Hisfatherjoinedtheparty_________(A)forthreeyears(B)sincethreeyearsago(C)threeyearsago(D)intwoyears'time()2.Hemoved
6、herein1999,andhehasbeenhere.(A)atthattime(B)forfiveyearsago(C)sincefouryears(D)forfouryears()3.Tomhasbeenawayfromhomeaboutfivedaysago.(A)(B)in(C)since(D)for五、句式：主句（现在完成时）＋since+从句（一般过去时）()1.sheEnglishinourschooleversinceshehere.(A)hastaught,come(B)taught,came(C)hastaught,hascome(D)teaches,hasc
7、ome()2.OurEnghishteacherinourschoolsincehetoChina.(A)hastaught..come(B)taught,…come(C)hastaught,has..come(D)teaches,has…come六、句式：It’s/Ithasbeen＋一段时间＋since从句（用一般过去时）一段时间＋haspassed＋since从句（用一般过去时）()1.It’stenyearssinceshe.(A)hasleft(
