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1、Unit2HEROES知识探讨文本互动 Listentothetapeagainandagainandtrytoimitatethedialoguewithyourclassmates. Tom:Hi,Lucy.We'vefinishedUnit2—Hero.Canyousaysomethingaboutit? Lucy:Yes,ofcourse.Fromthisunit,we'velearnedaboutmanyheroes.AndIreallyknowwhataheromeans.Aheroisapersonwhoisadmiredbymanyfortheirnoblequal
2、itiesandtheirbravery,anunselfishoneofstrongwillandgreatdetermination. Tom:Whoimpressedyoumost,then? Lucy:Ithinkit'sthespaceheroeswhoimpressedmemost.Inthecourseofspaceexploration,434astronautshavemadethejourneyintospace.Menandwomenfromnationsallovertheworldhavestudied,trainedandworkeddiligentlyi
3、nordertogointospace.Itisnotavocationwithoutriskand20ofthosepeoplehavemadethesacrificewhileinspaceorinspaceprogrammetraining.Theyhadahungertoexploretheuniverseanddiscoveritstruth.Theyservedallofus. Tom:Iagree.AndournationalheroYangLiweisucceededinreturningsafelytoearthafter21hoursinspaceinourfirs
4、tmannedspaceship.HeisaheroofallusChinese. Lucy:Hereallyis.Bytheway,canyouunderstandthethreetenseswellinthisunit?Andwouldyouliketoexplaintomehere? Tom:Letmetry.Thethreetensesarepastsimple,pastcontinuousandpresentperfect.Thecommonpointthethreehaveisthattheactionisinthepast.Buttheyaredifferent.Pa
5、stsimpleonlyemphasizesthepastaction.Presentperfect,however,putsmoreemphasisonthepresenteffectorthecontinuousactionuntilthepresentinspiteofthepastaction.Comparedwithpastsimple,pastcontinuousisusedtoexpressacontinuousactioninthepasttime,whichismorevivid． Lucy:Willyoupleasegivemesomeexamples? Tom:
6、OK.Listentothefollowingsentence: Itrainedlastnight. Itwasraininglastnight. Ithasrainedforabout10hours. Fromthefirstsentence,we'reonlytoldthefactthatitrainedlastnight.Butwecanimaginetherainwasgoingonfromthesecondsentence,whichismorevivid．Andthethirdonetellsusthattherainkeptraininglastnightunti
7、lnow.Inthissituationthesentencecanalsobelikethis:Ithasbeenrainingforabout10hours,whichispresentperfectcontinuous. Lucy:Isee,thanks.Oh,Tom,Whatdoyouthinkweshouldgraspinthisunit? Tom:Inmyopinion,we'dbettertrytomemorize
