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GrammarandusageUnit1Presentperfectorpresentperfectcontinuous?Weusethepresentperfecttensetotalkaboutanactioncompletedintherecentpastandthepresentperfectcontinuoustenseforanactionthatstartedinthepastandisstillhappening.LiJia__________(read)abookaboutStonehenge.(Shefinishedreadingthebook.)LiJia______________(read)abookaboutStonehenge.(Sheisstillreadingthebook.)2.Wecanusethepresentperfecttenseforrepeatedactionsandthepresentperfectcontinuoustensefornon-stopactions.3.Weusuallyusethepresentperfecttensetoaskquestionsbeginningwithhowmanyorhowmuchandthepresentperfectcontinuoustensetoaskquestionsbeginningwithhowlong.4.Wecanuseeitherastateverboranactionverbwiththepresentperfecttensebutweusuallycanonlyuseanactionverbwiththepresentperfectcontinuoustense.Ihavehadthiscameraforfiveyears.5.Weusethepresentperfecttensenotthepresentperfectcontinuoustensewiththewordslikeneveryetalreadyandever.ExerciseA:Readtheconversationandcircletherightwordstocompleteit.Answers:(1)heard(2)beendoing(3)beenresearching(4)beendoing(5)started(6)done(7)read(8)found(9)started(10)beendoing(11)beenmakingWheredoyouthinktheboyhasbeenwaiting?Whathavethealiensbeentravellingin?Whatdoesitlooklike?Whoelsehavethealienstalkedto?Whatotherplanetshavethealiensvisited?SampleanswersofPartB1.Hehasbeenwaitingatanunder-groundstation.2.TheyhavebeentravelinginanUFO.Itlookslikeasaucer.3.Theyprobablyhavetalkedtoanimalsorplantsontheearthaswellascreaturesonotherplants.4.TheyhavevisitedMarsVenusJupiterandsomeotherplanets.Gothroughwhatwelearnttodayandgetfamiliarwiththem.2.PrepareTa