高中英语Unit 21 Lesson 1 Chewing Gum 1课件北师大版选修7.ppt

chewinggum discussinpairsandanswerthefollowingquestions 1 whatdoyouthinkofchewinggum isitgoodorbadforyou 2 doyouoryourfriends familybuyit why 3 whatdoyoudoafterchewingit lookatthetitleofthemagazinearticleandpredictwhichissuesmaybecoveredinthearticle thenreadthearticlequicklyandseeifanyofyourguessesareright itisaboutwhetherchewinggumisgoodorbadforyou readthetextquicklyanddivideitintofourparts thensummarizethemaintopicofeachpart part1 paragrah part2 paragraph part3 paragraph part4 paragraph introduction benefitsofchewinggum thenegativesideofchewinggum betteractivitiesthanchewinggum 1 1 2 4 5 7 8 8 readthearticleagain andcompletethetable fight prevent stop lose giveup moredifficult stomach sickness brushing theirteeth sicknessorheadaches howseriousistheproblemofbadbreath whatisaddedtosugar freechewinggumwhichmayhelppreventtoothproblems accordingtooneresearchproject whatisonewayofburning70kilocalories whatwouldbetheeffectonthestomachofconstantchewing whatotheractivitiesarestatedthatarebetterthanchewinggum ask answer matchtheconditionalsentencesinitalicsinthetextwiththefollowingtypes zeroconditional1stconditional2ndconditional3rdconditional grammar whichofthesentencesinitalicstalkaboutthepast thepresentandthefuture readthesentences dotheydescribesituationsthatare trueorcouldpossiblyhappen imaginary unrealorcontrarytofacts ifhehastime hewillcome wewon tsucceedunlessweplanwell unless if not 从句用一般现在时或现在完成时 主句用一般将来时 ifiwereamillionaire iwouldbuyabighouse ifiwerethegirlinthestory iwouldcallthepoliceatonce tomorrowiwillgotousa ifiwereinchina iwouldmakedumplingswithyou iwasonmyownyesterday iftheyhadinvitedme iwouldhavegonetotheparty iwenttolibraryyesterday ifihadwenttotheconcert iwouldhavetakenphotoswiththesingers hehadtrafficaccidentyesterday ifhehaddrivenmorecarefully hewouldhavearrivedhomesafely 如果过去天气好一些 现在庄稼还会长得更好 iftheweatherhadbeenmorefavourable thecropswouldbegrowingstillbetter 注意 白字代表过去 黄字代表现在或将来 要是大夫昨晚来得早一点 amy今天还活着 ifthedoctorhadcomesoonerlastnight amywouldbealivetoday 如果他多得六票 他现在就是我们的主席 ifhehadreceivedsixmorevotes hewouldbeourchairmannow 1 ifyou atschool you acollegestudentnow a hadstudiedhard wouldhavebeenb shouldhavestudiedhard shouldhavebeenc hadstudiedhard wouldbed wouldstudyhard musthavebeen 2 you totheteacher you howtousetheidiomsnow a had listened wouldknowb if listen knowc if hadlistened wouldhaveknownd had listened know 3 ifhemissedthebus he toschoolonfoot a wouldgob wentc wouldhavegoned hadgone4 hadiknownhername a ordoessheknowmineb shewouldcomeherec iwouldhaveinvitedhertolunchd shehadcome 5 didyouhearwhatjacksaidtohisparents yes andi talkthatwayifi jack a won t amb wouldn t werec couldn t wered didn t were 6 he youifyou toseehimthisafternoon a mighttell wentb mighttell aregoingc mighthavetold wentd shouldtell willhavegone 7 it adifferentmatternowifyou hisadvice a is hadfollowedb was followedc mightbe hadfollowedd mightbe followed8 thesoldierdiedinthehospital he ifthedoctor onhimtwohoursbefore a mightbesaved operatedb couldhavebeensaved hadbeenoperatedc couldbesaved hadoperatedd couldhavebeensaved hadoperated ifhe he thatfood luckilyhewassenttothehospitalimmediately a waswarned wouldnottakeb hadbeenwarned wouldnothavetakenc wouldbewarned hadnottakend wouldhavebeenwarned hadnottaken ididn tseeyoursisteratthemeeting ifshe shewouldhavemetmybroth