Unit13We’retryingtosavetheearth第三课时SectionA(GrammarFocus－4c)【学习目标】1．学习并掌握新词汇：reusable，afford，transportation2．学习并会用以下常用表达：trytodosth.，usedtodosth.，is/aredoing，beconsidered，takepartin，playapartindoingsth.，helpwith，helpout，turnoff，insteadof，payfor，addup，affordtodosth.，not…anylonger，takeaction，It'sdifficultforsb.todosth.【学习重点】掌握背诵GrammarFocus中的句子。【学习难点】正确使用本课语法要点。Recently，theproblemofenvironmentalpollutionisgettingmoreandmoreserious.Theairpollution，noisepollutionandwaterpollutionarefoundonthenewspapereverywhere.Itisobviousthatweshoulddosomethingtoprotectourearth.Thentheteachercanleadintothenewlessonbyaskingandansweringquestions.Task1ReviewthewordsonP100，readthewordsbyphoneticsymbols.ThendrawnewwordsinlineandmarkChinesemeaning.【学法指导】◆afford承担得起，买得起通常与can，could，beableto连用。affordtodosth.负担得起做某事can'taffordtodosth.不能负担做某事如：Wecan'taffordtowaitanylongertotakeaction.我们再也等不起了，要采取行动。情景导入生成问题Teacher：Haveyouevertakenpartinanenvironmentproject?Howshouldyoudotosavetheenvironment?Students：Wecan________________________________________________________________________.①turnoffthelightswhen________________________________________________________________________.②usethepaperbags________________________________________________________________________.③walktoschool________________________________________________________________________.自学互研生成能力Task1Let'sreadthenewwordsandphrases.1．Icanread.(我会读)预习下列单词和短语，争取自己能正确拼读。拼读成功后再在课文中把单词和短语标记出来。takepartin，reusable，afford，transportation，payfor，takeaction2．Icanwrite.(我会写)翻译下列短语：(1)参加take__part__in(2)负担不起做某事can't__afford__to__do__sth.(3)采取行动take__action(4)关掉turn______off__(5)付费pay__for(6)累加add__up(7)使用公共交通use__public__transportationTask2Let'ssumupaboutthePassivevoice，Presentperfect，PresentprogressiveandModalverbs.1．Icantranslate.(我会译)完成下列句子。(1)我们正在尽力拯救地球。Weare__tryingtosavetheearth.(2)这条河里过去这样干净。Theriverused__to__besoclean.(3)空气被严重受到污染。Theairis__badly__polluted．(4)没有科学的研究显示鲨鱼鳍对健康有益。Noscientificstudieshave__shownthatsharkfinsaregood__forhealth.(5)我们应当帮助拯救鲨鱼。Weshould__help__savethesharks.2．Icanpractice.(我会练)完成P100页4a和4b的练习。3．Icanmakeconversations.(我会编对话)根据4c的提示，编一段对话介绍自己的对环境保护的策略。4．Icansummarize.(我会总结)(1)现在进行时：概念：表示现阶段或说话时正在进行的动作及行为。时间状语：now，atthistime，thesedays，etc.基本结构：am/is/are＋doing否定形式：am/is/are＋not＋doing一般疑问句：把be动词放于句首。(2)usedto的意思是“过去经常”，其中的to是不定式符号，不是介词，所以其后接动词原形(不接动名词)。(3)现在完成时：概念：过去发生或已经完成的动作对现在造成的影响或结果，或从过去已经开始，持续到现在的动作或状态。时间状语：recently，lately，since…for…，inthepastfewyears，etc.基本结构：have/has__＋__done否定形式：have/has__＋__not__＋done(4)被动语态：概念：当主语为动作的承受者时，谓语要用被动语态。基本机构：“助动词be＋及物动词的过去分词”构成。含有情态动词的被动语态由“情态动词＋be＋及物动词的过去分词”构成。助动词be有人称、数和时态的变化，其变化规则与be作为连系动词时完全一样。(5)情态动词should后接动词原形。①表示“...
