Unit2SavingtheEarthTopic1Pollutionhascausedtoomanyproblems.SectionAⅠ.Teachingaims1.Knowledgeaims：掌握本課的重點詞匯和短語，鞏固一般過去時和現(xiàn)在完成時的用法和區(qū)別。能夠用一般過去時和現(xiàn)在完成時描述過去和現(xiàn)在的變化。正確使用therebesth./sb.doingsth.來表達(dá)“有某人/物正在做某事”。2.Skillaims:能聽懂描述環(huán)境變化的對話，區(qū)別一般過去時和現(xiàn)在完成時的用法。能理解和運用一般過去時和現(xiàn)在完成時來進行聽、說、讀、寫活動。3.Emotionalaims:(optional)讓學(xué)生了解環(huán)境污染的嚴(yán)重性，并樹立環(huán)保意識。4.Cultureawareness:(optional)通過課文的學(xué)習(xí)，讓學(xué)生了解環(huán)境的變化,增強保護環(huán)境的意識。Ⅱ.Thekeypointsanddifficultpoints1.Keypoints:Wordsandphrases:bee,butterfly,mess,several,pollute,waste,pourinto,seesb./sth.doingsth.Sentences:Whatamess!Therebesth./sb.doingsth.Grammar:differencesbetweenSimplePastandPresentPerfecttense.Difficultpoints：正確使用therebesth./sb.doingsth.來表達(dá)“有某人/物正在做某事”。正確使用短語seesb./sth.doingsth.。能正確地以口頭和書面形式區(qū)別使用一般過去時和現(xiàn)在完成時。Ⅲ.Learningstrategies通過引導(dǎo)學(xué)生在聽前閱讀，培養(yǎng)學(xué)生形成聽前熟悉、預(yù)測聽力材料的習(xí)慣。通過8張圖片的對比，引導(dǎo)學(xué)生感知一般過去時和現(xiàn)在完成時的區(qū)別，并能正確的描述圖片。通過聽后回答問題，培養(yǎng)學(xué)生整合對話信息，將對話轉(zhuǎn)換為語篇的能力。Ⅳ.Teachingaids多媒體課件Ⅴ.TeachingproceduresLeadinShowthelearningaims.Showthe8pictures.2.Pre-listening(1)SumupwhenweuseThePastTense,ThePresentTenseorThePresentperfectTensebydescribingthefirst4pictures.Andlearnthephrases:seesb./sth.doingsth.,Therebesth./sb.doingsth.(2)Trytodescribepicture5andpicture6,andlearnthenewwordsandphrases:mess,several,waste,pourinto.3.While-listening(1)Listento1aandanswerthequestion:Whataretheytalkingabout?(2)Listento1aanddo1balone.(3)Listento1aandanswerthequestions:1.Wherewilltheygoforthepicnic?Andwhywilltheygothere?2.Willtheyhaveapicnicthere?Andwhy?4.Post-listening(1)DescribethepicturesoftheWestHilltwoyearsagoandtheWestHillnowandlearnthenewwords:bee,butterfly.(2)Read1atogether.(3)Read1aandfillintheblanks.KnowwhenweuseThePastTense,andwhenweuseThePresentTenseorThePresentperfectTense.5.ProjectGroupwork:Choosetwooftheeightpicturestodescribe,andwriteitdown.Thenshowthem.6.SummarySumupthemaincontentofthisclassandthekeypoints:Wordsandphrases:bee,butterfly,mess,several,pollute,waste,pourinto,seesb./sth.doingsth.Sentences:Whatamess!Therebesth./sb.doingsth.Grammar:differencesbetweenSimplePastandPresentPerfecttense.7.HomeworkWriteashortpassageaboutaplaceaccordingto1a.要求：1.描述這個地方過去和現(xiàn)在的變化。2.發(fā)生變化的原因。3.對于這些變化你有什么感想。字?jǐn)?shù)：100詞左右。8.情感升華：From“terrible”to“beautiful”,whatshouldwedo?Weshouldsavetheearth,ouronlyhome.Ⅵ.BlackboarddesignUnit2SavingtheEarthTopic1Pollutionhascausedtoomanyproblems.SectionATwoyearsago“beautiful”TheWestHillpollute saveNow“terrible”Therebesth./sb.doingseesb./sth.doingsthWhatamess!pourintobutterflyseveralwastebeeG1