英语：必修2 unit1 tales of the unexplained-grammar课件(译林牛津版)

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1、1.PresentPerfectTense2.PresentPerfectContinuousTenseM2U1Grammar&usageⅠ、现在完成时1.现在完成时的构成2.现在完成时的用法Ⅱ、现在完成进行时1.现在完成进行时的构成2.现在完成进行时的用法Ⅲ、现在完成时和现在完成进行时的比较现在完成时和现在完成进行时的基本用法1.现在完成时的构成：主动式:have/hasdone被动式:have/hasbeendone1.现在完成时We___________________(alreadyopen)thewi

2、ndow.过去的动作:weopenedthewindow.对现在的影响:Thewindowisopen.havealreadyopened2.现在完成时的用法Theboysaretired.They________________(justplay)aballgame.过去的动作:Theboysplayedaballgame.对现在的影响:Theboysaretired.havejustplayed现在完成时表示过去发生或已完成的动作，或某一动作对现在造成的影响或结果。通常与表示包括现在在内的时间副词just,

3、already,before,yet,never,ever,lately,recently等状语连用。小结：现在完成时用法1---已完成、影响性用法already:用于肯定句;yet:用于否定和疑问句Daniel__________(live)inBeijingsincehecametoChina.haslivedpastfuturenowcamelivehaslived现在完成时表示过去已经开始，持续到现在,也许还会持续下去的动作或状态。可以和表示从过去某一时刻延续到现在（包括现在在内）的一段时间的状语连用。

4、如：①for和since，②sofar,uptonow,today,until/till…,thisweek(month,year)③during/over/inthepastfewyears(weeks,months…)现在完成时用法2---未完成用法小结：Fillintheblanks:①.a.ShehaslearntEnglish3years.b.ShehaslearntEnglish3yearsago.c.Theyhavelivedhere_____1990.forsincesince②I(see)he

5、rsofar.③What_________________(happen)totheUSAinthepast35years?haven’tseenhashappenedSince的补充用法A.主句+since+从句Greatchangeshavetakenplacesinceyouleft.B.Itis+时间段+since+从句Itis/hasbeentwoyearssinceIleftmyhometown.b.Itwas/hadbeentwoyearssinceIhadleftmyhometown.c.Iti

6、syearssinceIsmoked.d.ItisyearssinceIbegantosmoke.IwenttoEgyptin1986.IwenttoEgyptin2004.I__________(be)toEgypttwice.havebeen现在完成时可过去发生过一次或多次的情况，也可以说是一种经历。现在完成时用法3---经验性用法I（notsee）anythingsobeautifulinmylife.haven’tseen小结：√()1.Hehascomehere.()2.Hehascomeherefo

7、r3days.()3.Hehasn’tcomeherefor3days.()4.Hehasstayedherefor3days.()5.Hehasbeenawayfor3days.√现在完成时知识扩展一√√与现在完成时有关的句型:1)This(That/It)isthefirst(second…)time+that-clauseThisisthefirsttimethatI_________(see)pandas2)This(That/It)istheonlytime…+that-clauseItistheo

8、nlytimethatI_____________(travel)abroad.3)This(That/It)isthebest/finest/mostinteresting…+that-clause.ItisthemostdeliciousfoodthatI___________(taste)haveseenhavetraveledhavetasted现在完成时知识扩展二Presen