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1、M2U1GrammarandusagePresentperfecttense&Presentperfectcontinuoustense一、现在完成时1、构成have/hasdone2、用法I表示过去发生的事对现在具有影响。1）Justinhasdisappeared,soKellyisverysad.2）Theboyishappy.Hehascaughtabird.II表示过去开始的动作一直延续到现在或者还将持续下去。1）IhavenotseenJustinsinceLastFridaynight.2)Danielhaslived
2、inBeijingsincehecametoChina.III表示动作的确切时间不明确或不重要。此时下列词汇经常和现在完成时连用：already,ever,never,for,just,lately/recently,since,yet。1）Theboyhasalreadycomehome.2）Ihaven’theardanythingfromhimyet.其中，for+一段时间，since+某个时间点。e.g.Wehaven’tseenhimfortwodays.Wehaven’tseenhimsincelastMonday.IV
3、表示到现在为止的一段时间内重复的动作。1）SomevillagerssaythattheyhaveseenUFOsmanytimes.2）Ihaveadvisedhimtogiveupsmokingmanytimes,buthejustwon’tlistentome.V现在完成时还可用于下列句型中：This/Itisthebest/finest/mostinteresting…+that-clause,This/Itisthefirst/second…time+that-clause,that从句中的谓语动词一般用现在完成时。Iti
4、s/hasbeenaperiodoftimesince+一般过去时1）ThisisthebestbookthatIhaveread.2）ItisthefirsttimethatIhaveseenthefilm.3）Itis/hasbeenalongtimesinceIcametoWuxi.3、注意1）现在完成时不和明确的表示时间的词连用，如yesterday,lastweek,in1976等。2）表示短暂意义的动词，如begin,leave,arrive,return,stop,open,go,come,die等，不能与表示一段时间
5、的状语连用。*ReadthefollowingsentencesandsayTorF.(1)HehascometoBeijingsincelastyear.F(2)Hehasbeenhereforthreeyears.T(3)HehasjoinedthearmyforthreeyearsF(4)Hehasbeenasoliderfor3years.T(5)Itis3yearssincehejoinedthearmy.T(6)Hehasjoinedthearmy.T二、现在完成进行时1、构成have/hasbeendoinge.g.I
6、haven’tbeensleepingwellsinceIreturnedhome.2、用法表示动作从过去开始一直延续到现在，可能刚刚停止，也可能仍然在进行。1）--Sorry,I’mlate.Haveyoubeenwaitinglong?--Yes.Ihavebeenwaiting(wait)foranhour.2)Sheisverytired.Shehasbeenworking(work)allmorning.3)Themanstartedworkinginthefieldhalfanhourago.Heisstillworki
7、ngnow.Themanhasbeenworking(work)inthefieldforhalfanhour.4)Theboystartedhavingdinnerfiveminutesago.Heisstillhavingdinnernow.Theboyhasbeenhaving(have)dinnersincefiveminutesago.3、注意现在完成进行时多用持续性动词，如do,live,learn,lie,stay,wait,stand,study等，常和allthetime,thisweek,thismonth,al
8、lnight,allthemorning,recently等表示现在之前这一段时间的状语以及since和for引导的时间状语或从句连用。e.g.Hehasbeenwatchingtelevisionallday.Ihavebeenle
