人教版·九年级下册英语Unit13We'retryingtosavetheearth!SectionAGrammarFocus－4c情景导入Haveyouevertakenpartinanenvironmentalproject?Whatshouldyoudotosavetheenvironment?Wecan……①turnoffthelightswhen…②usethepaperbags③walktoschool…生成新知GrammarFocusWe’retryingtosavetheearth.PresentprogressiveTheriverusedtobesoclean.usedtoTheairisbadlypolluted.PassivevoiceNoscientificstudieshaveshownthatsharkfinsaregoodforhealth.PresentperfectWeshouldhelpsavethesharks.Modalverbs时态定义构成常见标志词现在进行时现在完成时被动语态表示现在或现阶段正在发生或进行的动作表示过去发生的动作对现在产生的影响或结果主语是谓语动作的承受者am/is/are+动词-ing形式have/has+动词过去分词be+动词过去分词now,atthemoment(此刻),look,listenalready,just或yetFillintheblanks.Fillintheblanks.1.听！一些女孩正在教室里唱歌。Listen.Somegirls___________intheclassroom.2.他们已经打扫了教室。They______already_______theclassroom.aresinginghavecleaned3.这儿的人不说英语。English______________bypeoplehere.4.我曾去过那个国家。I______ever______tothatcountry.isn’tspokenhavebeen情态动词本身有一定的词义,表示说话人的情绪、态度或语气,但不能单独作谓语,只能与其他动词构成谓语。常见的有:can(could),may(might),must,need,shall(should),will(would)等。情态动词情态动词无人称和数的变化，后接动词原形。否定式是在情态动词后面加not。个别情态动词有过去式形式，可用来表达更加客气、委婉的语气。Kencanclimbupthetreeslikeakoala.Tracycouldrideabicyclewhenshewasfiveyearsold.Youmustn’tplaywithfire.Itisdangerous.Translation.1.我们不能在教室里吃东西。2.首先你必须完成作业。3.他现在不可能在家。4.她一定知道这个问题的答案。Wecan’teatintheclassroom.Youmustfinishyourhomeworkfirst.Hecan’tbeathomenow.Shemustknowtheanswertothisquestion.4aFillintheblankswiththecorrectformsoftheverbsinbrackets.Joe:______youever______(take)partinanenvironmentalproject?Ken:Yes,Ihave.I_______(help)withaClean-UpDaylastyear.Itwas__________(consider)thebiggestclean-upprojectthiscity____ever____(have).Joe:Howmanypeople_____(take)part?HavetakenhelpedconsideredhadhadtookKen:I_____(thi...
