《英語時(shí)態(tài)》課件

EnglishTensePPTcoursewareContents目錄IntroductiontoEnglishTensePresenttensePasttenseFuturetensePastfuturetenseThemixeduseoftensionsIntroductiontoEnglishTense01UnderstandingtheconceptandfunctionoftensesisthefoundationoflearningEnglishgrammar.SummaryTenseisaformofEnglishgrammarusedtorepresentastateoftime,whichhelpsusexpressthetimewhenanactionorstateoccurs.Understandingandusingtensescorrectlycanmakeourlanguageexpressionmoreaccurateandrich.DetaileddescriptionTheConceptandFunctionofTenseSummaryUnderstandingthetypesandclassificationsoftenseshelpstobetterunderstandandapplyvarioustenses.DetaileddescriptionInEnglish,therearemainlythreetenses:present,past,andfuture,eachofwhichhasthreeforms:general,continuous,andperfect.Inaddition,therearesomespecialtenses,suchaspastfuturetense,futureperfecttense,etc.UnderstandingthesetypesandclassificationshelpsusbetterunderstandandapplyEnglishtenses.ThetypesandclassificationsoftensionsPresenttense02Definition01ThepresentcontinuoustenseisusedtoexpressactionsorsituationsthatareongingatthepresentmomentFormat02Thepresentcontinuoustenseisformedbycombiningthepresenttenseoftheverb"tobe"(am,is,are)withthe-ingformofthemainverbExamples03Iamstudying,Theyareplaying,WeareeatingPresentcontinuoustense

PresentperfecttenseDefinitionThepresentperfecttenseisusedtoexpressactionsorsituationsthathaveoccurreduptothepresentmomentFormatThepresentperfecttenseisformedbycombiningthepresenttenseoftheverb"tohave"withthe-edor-enformofthemainverbExamplesIhavestudied,Theyhaveplayed,WehaveeatenTheusageandprecautionsofthepresenttenseThepresenttenseisusedtoexpressactionsorsituationsthatarehappeningnow,suchas"Iamwritingaletter"or"SheisstudyingEnglish"UsageWhenusingthepresenttense,itisimportanttonotethatitshouldnotbefusedwiththepresentcontinuoustenseorthepresentperfecttenseThepresenttensedoesnotexpressanyactionsorrecentpastevents,butratheractionsorsituationsthatarehappeningnowPrecautionsPasttense03Example:Iwasreadingabookat9O'clocklastnightIndicatesanactionthatwastakingplaceduringacertainperiodoftimeinthepastThepastcontinuoustenserepresentsanactionthatwastakingplaceatacertainmomentorperiodinthepast,usuallyusedinconjunctionwithtimeadverbssuchas"atthattime","at3oclockyesterday","between8and10inthemorning",etc.PastcontinuoustenseActionscompletedinthepastThepastperfecttenseindicatesanactionthatwascompletedbeforeacertaintimeinthepast,usuallyusedinconjunctionwithtimeadverbssuchas"before","bytheendof","until",etc.Example:IhavefinishedmyhomebeforegoingtobedPastperfecttenseNotesonusingthepasttenseWhenusingthepasttense,attentionshouldbepaidtotheaccuracyofthetensetoavoidconfusionbetweenthepresentperfecttenseandthepastperfecttense.Atthesametime,whendescribingpastevents,oneshouldfollowchronologicalordertoavoidconfusionintime.Example:Iwenttotheparkyesterday(simplepasttense)Ihavegonetotheparkbefore(pastperfecttense)TheusageandprecautionsofthepasttenseFuturetense04IndicatesanactionbeingtakenatacertaintimeinthefutureThefuturecontinuoustenseinEnglishisformedbycombiningtheauxiliaryverbs"will"or"shall"withthe-ingformoftheverbItisusedtoexpressanactionthatwillbeongingatsomepointinthefutureForexample,"IwillbestudyingEnglishnextyear"meansthatthestudyingofEnglishwillbeongoingduringthenextyearFuturecontinuoustenseIndicatesactionsthathavebeencompletedbeforeacertaintimeinthefutureThefutureperfecttenseinEnglishisformedbycombiningtheauxiliaryverb"willhave"withthepastparticleoftheverbItisusedtoexpressanactionthatwillbecompletedbeforeafuturepointintimeForexample,"Iwillhavefinishedmyhomebynextweek"meansthatthehomewillhavebeencompletedbythefollowingweekFutureperfectTheusagescenariosandprecautionsoffuturetensesFuturetenseinEnglishisusedtotalkabouteventsorsituationsthathavenotyetoccurredbutwillhappeninthefutureItisimportanttonotethattheuseoffuturetensedependsonthecontextandtheinformationprovidedbythespeakerWhenusingfuturetense,itisessentialtoconsiderthetimereferenceandensurethatitiscleartothelistenerorreaderItisalsoimportanttoavoidusingfuturetensewhenthecontextisalreadyestablishedaspastorpresentTheusageandprecautionsoffuturetensePastfuturetense05DefinitionThepastfuturecontinuoustenseisusedtoexpressanactionthatwasonginginthepastandwouldcontinueintothefutureExample"Shesaidshewouldbestudyingfortheexamallweek."UsageThistenseiscommonlyusedwhenreferringtoscheduledorplannedevents,aswellasactionsthatwereinprogressinthepastandhadrelevancetothefuturePastfuturecontinuoustense010203DefinitionThepastfutureperfecttenseindicatesanactionthatwouldhavetakenplaceinthepastandwouldhavebeencompletedbeforeanotheractioninthefutureExample"Theysaidtheywouldhavefinishedtheprojectbytheendoftheyear."UsageThistenseistypicallyemployedwhenreferringtoactionsthatwereexpectedorintendedtohaveoccurredinthepastandwouldhavehadreleasetoafutureeventPastfutureperfecttenseUsageThepastfuturetenseisprimarilyusedtoexpressactionsorsituationsthatwouldhaveoccurredorbeenongoinginthepastandwouldhavereleasedtoafutureeventItiscommonlyemployedinconditionaloccasionsandwhenreferringtoscheduledorplannedevents要點(diǎn)一要點(diǎn)二PrecautionsWhenusingthepastfuturetense,itisimportanttoensurethatthecontextmakessenseandthattheintendedmeaningisclearAvoidusingitincontextswhereitcouldbefusedwithothertensions,suchasthesimplepastorfutureperfecttenseTheusageandprecautionsofthepastfuturetenseThemixeduseoftensions06TransitionoftensionsWhennarratingaseriesofeventsinachronologicalorder,theuseoftensionsshouldflownaturallyfromonetoanother,soasstartingwiththepresentsimpletenseandendingwiththefuturesimpletenseAlternativeoftensionsIndialoguesorwhencomparingpastandpresentsituations,theuseoftensionsmayalternatebetweenthepastsimpleandpresentsimple,dependingonthecontextandemphasisdesiredTransitionandalternationoftensionsLogicalrelationshipThechoiceoftenseshouldbelogicalandcoherent,followingthenaturalflowofeventsoractionsForexample,ifapasteventismentionedfirst,thesuccessfulactionsshouldgenerallybeinpasttense,lessthereisaspecificreasontousead