Unit 5 understanding ideas课(共25张PPT)件 外研版（2024）七年级英语上册.pptxVIP

UnitAncientstories6Module3CultureandhistoryGrammar

标志词/时间状语标志词的区分ThePresentPerfectTense现在完成时用法结构完成时VS过去时havebeentohavegoneto句型转换

现在完成时vs.一般过去时Ihavelostmywatch.Ilostmywatch.现在完成时表示过去发生的某一动作对现在造成的影响或结果，强调与现在的关系。一般过去时只是表示动作是发生在过去，和现在并没有什么直接与必然的联系。

Thedifference:一般过去时VS现在完成时结构不同强调重点不同标志词(时间状语)不同般过去时动词过去式--ed陈述过去发生的事情，与现在无关yesterday,.ago,in2005,last...等过去的时间现在完成时have/hasdone强调已经完成的事情与现在有关，对现在有影响already,yet,ever,never,twice,…times(次),sofar,uptonow,recently,lately,for+时间段，since+时间点since...ago,sincelast..since+从句(一般过去时)等

PASTSIMPLE-signalwordlast…(ittellsuswhenithappened)Wetoaconcerthavegonelastweek.TRYAGAINwentgonego

ILindaatthecinemayesterday.tellsuswhenithappened)PASTSIMPLE-signalhaveseenhasseenTRYAGAINwordyesterday(itsawseen

PRESENTPERFECT-signalwordalreadyShealreadyhas...eatenhas...eatshas...atehas...eatbreakfast.(forarecentlyfinishedTRYAGAINaction)

PASTSIMPLE-signalword….ago(itisafinishedpastaction)BobfiveminuteshasleavehasleftTRYAGAINleaveleftago.

MikeandSamfromschoolyet?PRESENTPERFECT-signalwordyet(weHave/arrivedHas/arrivedDid/arrivedDid/arriveexpectsomethingtohappenTRYAGAINsoon)

IonholidayssincehavebeenhavewasPRESENTPERFECT(foranunfinishedpast-signalwordsinceFriday.TRYAGAINwerewasaction)

Myteacherjust withmyparents.-signalword“just”(forarecentevent)spokespeakhave…spokenhas..spokenPRESENTPERFECTTRYAGAIN

Heearlythiscompletedpastperiod(itsprobablyaftermiddaynow)haventgetuphasntgetupdidntgotupdidntgetupPASTSIMPLE-thismorningisaTRYAGAINmorning.

Whensheawewanttoknowwhensomethinghappenedhas...boughthave...boughtdid...boughtdid...buynewcar?TRYAGAINPASTSIMPLE-

PRESENTPERFECT-signalwordever(foryoueveracarHave...hadDid...haveHas...hadDid...hadaccident?TRYAGAINp