学牛津版必修二Unit 1 Tales of the unexplainedgrammar课件（共27张PPT）.ppt

module2unit1talesoftheunexplained whydowecarryoutspaceexploration grammarandusage wehavebeendoingresearchonspaceexploration presentperfectcontinuoustense wehavedoneresearchonspaceexploration presentperfecttense 1 doyouknowwhenweshouldusethepresentperfecttense a whenwetalkaboutthingsthathappenedintherecentpast butareconnectedtothepresent e g thedisappearanceofjustinhasmadekellyveryunhappy b whentotalksththatstartedinthepast andisstillhappeningnow e g ihavenotseenjustinsincelastfridaynightc whentotalkaboutactionsthatwerecompletedonlyashorttimeagoe g thepolicehavejustfinishedsearchingthearea d forrepeatedactionse g somevillagerssaythattheyhaveseenufosmanytimes 2 whatisthebasicstructureofthepresentperfecttense subject auxiliaryverb has have done object 3 weoftenuseitwithtimeexpressions suchas alreadyeverforjustlatelyneverrecentlysinceyet q1 what sthedifferencebetweenalreadyandyet e g theboyhasalreadycomehere ihaven theardanythingfromhimyet tip alreadyisforaffirmativestatements yetisfornegativestatements q2 what sthedifferencebetweenforandsince e g 1 wehaven tseenhimfortwoyears 2 wehaven tseenhimsince2002 tip for aperiodoftime since apointintime myfriendjackhasjustsentmeane mail tellingmeabouthistravelsaroundtheworld he justbeen toqomolangmabasecampand see ayetithere heisstillveryexcitedaboutit he visit thegreatpyramidinegypttoo hesaysthathe love egyptbuthe notvisit allthepyramidsyet he swim inlochness butluckilyhe nevermeet thelochnessmonster he dive intheindianoceanmanytimeslookingfortreasure althoughhe find manysunkenships he notfind anytreasure he be tothegreatwallbefore i mnotsure butihave hasjustbeen saw hasvisited loves hasn tvisited hasswum hasnevermet hasdived hasfound hasn tfound hasbeen presentperfectcontinuoustensewhentouseit a whenwetalkaboutactionsthatstartedinthepastandarestillcontinuing e g ihavenotbeensleepingwellsinceireturnedhome b whenwetalkaboutactionsthathavejustfinishedbutarestillconnectedtothepresentinsomeway e g kelly sorryi mlate haveyoubeenwaitinglong mavis yes i vebeenwaitingforanhour non stop 2 whatisthestructure subject have hasbeendoing fillinthemissingwords they 2 tomesince1964 theyspeakenglishwell havebeentalking ialsoknowsomeyetis i 3 photosofthemsince1977 havebeentaking i 4 thelochnessmonsterontheinternettoo havebeenwatching recentlyi 5 anunusualnumberofufos haveseen i 6 abookonufos ishouldbeabletofinishitearlynextyear havebeenwriting homework 评价手册lesson5seeyounexttime presentperfectorpresentperfectcontinuous grammarandusage 2 differencesbetweenthem 1 completedintherecentpast startedinthepastandisstillhappening lijiahasreadabookaboutstonehenge shefinishedreadingthebook lijiahasbeenreadingabookaboutstonehenge sheisstillreadingthebook 2 forrepeatedactions fornon stopactionse g ihavevisitedegypttwicethismonthsihavebeentouringegyptfortwomonthsaskingquestionswith howmanyorhowmuch howlonge g howmanytimeshaveyouswuminthelake howlonghaveyoubeenswimminginthelake 3 astateverboranactionverb anactionverbe g ihavehadthiscameraforfiveyears ihavetakenphotosofufoswithcamera ihavebeentakingphotosofufoswiththiscamera 4 never yet alreadyandeverisjustforpresentperfecttense i venevervisitedparisi vealreadybeentoparis choosetherightwords wheredo