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1、各種時態EnglishGrammarCHAPTER6. THEPASTCONTINUOUS,THEPASTPERFECTANDTHEPASTPERFECTCONTINUOUS1.SummaryoftheusesoftheEnglishtensesTherearefourtypesofverbtenseinEnglish:theSimple,theContinuous,thePerfect,andthePerfectContinuous.EachtypeoftensehasaPresent,aPast,andaFutureform,asw
2、ellasothermodalforms.Thus,justastherearefourpresenttensesinEnglish,therearealsofourpasttenses:theSimplePast,thePastContinuous,thePastPerfect,andthePastPerfectContinuous.Aswillbeshownbelow,thethreeformsofeachtypeoftensearecloselyrelatedintermsoftheiruseandformation.Forins
3、tance,thePresentContinuous,PastContinuous,andFutureContinuoustensesareallusedtoexpresscontinuous,ongoingactions;andareallformedfromtheverbtobefollowedbythepresentparticiple.ThedifferencesarethatthePresentContinuousisformedwiththeSimplePresentoftheverbtobe,andisusedmainly
4、toexpresspresentactions;thePastContinuousisformedwiththeSimplePastoftheverbtobe,andisusedtoexpresspastactions;andtheFutureContinuousisformedwiththeSimpleFutureoftheverbtobe,andisusedtoexpressfutureactions.TheusesoftheSimple,Continuous,Perfect,andPerfectContinuoustensesar
5、esummarizedinthefollowingtable.TheUsesoftheEnglishTensesTypeofTenseTypeofActionExpressedSimple-actionsoccurringatregularintervals -generaltruths,orsituationsexistingforaperiodoftime -non-continuousactions Continuous-continuous,ongoingactions Perfect-non-continuousactio
6、nscompletedbeforeacertaintime PerfectContinuous-continuous,ongoingactionscompletedbeforeacertaintime 2.Thepastcontinuousa.UseThePastContinuoustenseisusedtoexpresscontinuous,ongoingactionswhichtookplaceinthepast.Inthefollowingexamples,theverbsinthePastContinuoustenseareu
7、nderlined.e.g.HewastravelinginEuropelastsummer. Theywereplayingtennisyesterdayafternoon.ThePastContinuoustenseisfrequentlyusedtorefertoanongoingactionwhichwastakingplacewhensomethingelseoccurredinthepast.e.g.Iwaswashingthedisheswhenthetelephonerang. Wewereentertainin
8、gfriendswhentheparcelarrived.Inthefirstexample,theuseofthePastContinuoustenseindicatesthattheactionofwa
