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1、PollutionhascausedtoomanyproblemsSectionA(1a-1c)徐代霞Teachingaims1.Knowledgeaims：掌握本课的重点词汇和短语，巩固一般过去时和现在完成时的用法和区别。能够用一般过去时和现在完成时描述过去和现在的变化。正确使用therebesth./sb.doingsth.来表达“有某人/物正在做某事”。2.Skillaims:能听懂描述环境变化的对话，区别一般过去时和现在完成时的用法。能理解和运用一般过去时和现在完成时来进行听、说、读、写活动。3.Emotionala
2、ims:(optional)让学生了解环境污染的严重性，并树立环保意识。4.Cultureawareness:(optional)通过课文的学习，让学生了解环境的变化，关注全球的环境问题。Keypoints:Wordsandphrases:bee,butterfly,mess,shame,several,pollute,waste,villager,destroy,cutdown,goodness,pour,seesb./sth.dosth.,seesb./sth.doingsth.,cutdown,mygoodnessSe
3、ntences:Whatashame!/Whatamess!Theflowersandgrasshavegone!Whathashappenedhere?Therebesth./sb.doingsth.Thereareseveralfactoriespouringwastewaterintothestream.Everythinghaschanged.Grammar:differencesbetweenSimplePastandPresentPerfecttense.Difficultpoints：正确使用therebest
4、h./sb.doingsth.来表达“有某人/物正在做某事”。区别使用短语seesb./sth.dosth.和seesb./sth.doingsth.。能正确地以口头和书面形式区别使用一般过去时和现在完成时。Teachingsteps:Step1:GreetingGreetandtalkabouttheweather.LeadtheSstodiscusstherightplaceforapicnic.T: Hi,boysandgirls!It’saniceday,isn’tit?Ss:Yes.T:Wouldyouliketo
5、haveapicnicwithme?Ss:I’dlikethat./Soundsgreat.T:Sowhereshallwego?Ss...Step2:Presentation1.PresenttwopicturesoftheWestHillanddescribethechanges.Teachthenewwordsandsomedifficultsentences.(ShowtheoldpictureoftheWestHilltotheSs)T:Lookatthisbeautifulpicture.Kangkangandh
6、isfriendshadapicnictheretwoyearsago.Canyouguesswhereitis?Ss:Yes,it’stheWestHill.T:Whatcanyouseeinthepicture?S1:Someflowers,acleanriverandabigtree…T:Right.TheWestHillisabeautifulplace.Canyouseethebeesandbutterfliesdancingthere(Pointtothebeesandbutterflies,andthenwri
7、tedownthewordsandphrasesontheBb)T:Sodoyouwanttogothereforapicnic?Ss:Yes…T:I’dliketo.Butnowithaschangedalot.Lookatthispicture.Doyoulikeit?Ss:No.(Teacherpresentsthenewwordsanddifficultsentencesthroughthedescriptionofthepicture.)2.LettheSsdiscusswheretohaveapicnic.Enc
8、ouragethemtostatethereasons.T:Nowworkingroups,choosethebestplaceforapicnicandtelltheclasswhyyouchoosethatplace.Ss…T:OK,telluswheretohaveapicnic.W
