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1、Talesoftheunexplained M2U1Grammarandusage Presentperfecttense&Presentperfectcontinuoustense 一、现在完成时 1、构成have/hasdone 2、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)IhavenotseenJustinsinceLastFrida
2、ynight. 2)DanielhaslivedinBeijingsincehecametoChina. 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’tseenhim
3、sincelastMonday. IV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
4、一般用现在完成时。 Itis/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
5、能与表示一段时间的状语连用。 *ReadthefollowingsentencesandsayTorF. (1)HehascometoBeijingsincelastyear.F (2)Hehasbeenhereforthreeyears. T (3)Hehasjoinedthearmyforthreeyears F (4)Hehasbeenasoliderfor3years. T (5)Itis3yearssincehejoinedthearmy. T (6)Hehasjoinedthearmy. T 二、现在完成进行时 1、构成have
6、/hasbeendoing e.g.Ihaven’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
7、.Heisstillworkingnow. 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,th