高中英语 Unit1Tales of the unexplained Grammar and usage 1精品课件 牛津译林必修2.ppt

GrammarandusagePresentperfecttenseThedisappearanceofJustin_______(make)Kellyveryunhappy.·I___________(notsee)JustinsincelastFridaynight.3.Weusethepresentperfecttensewhentheexacttimeofanactionisnotclearorimportant.Weuseitwithtimeexpressionssuchas:alreadyeverforjustlatelyneverrecentlysinceyetExercise:completethefollowingsentenceswiththepropertense:(1)We____________(study)Englishforaboutfiveyears.(2)They__________(live)inthesouthsincetheirdaughterwasborn.(3)I__________(read)yourarticlethreetimes.It’swellwritten.(4)Thestudent______________(finish)herhomeworkalready.(5)Eric_____just_____(go)backtohishometown.Weusealreadyforaffirmativestatementsandyetfornegativestatements.Weusefor+aperiodoftimeandsince+apointintime.4.Weusethepresentperfecttensetotalkaboutactionsthatwerecompletedonlyashorttimeago.5.Wecanalsousethepresentperfecttenseforrepeatedactionsthatisweusethepresentperfecttensewiththetimeexpressionsonce/twice/threetimes…6.Form:have/has+thepastparticipleoftheverbStep3Readthediaryentryandthencompleteitusingthecorrectformsoftheverbsinbrackets.Presentperfectcontinuoustense2.Weusethepresentperfectcontinuoustensetotalkaboutactionsthatstartedinthepastandarestillcontinuing.IhavenotbeensleepingwellsinceIreturnedhome.Past_____________________________________Present3.Wealsousethepresentperfectcontinuoustensetotalkaboutactionsthathavejustfinishedbutarestillconnectedtothepresentinsomeway.Kelly:SorryI’mlate.Haveyoubeenwaitinglong?Mavis:Yes.I’vebeenwaitingforanhour.havebeenobservingPrepareGrammarandusag