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1、Unit13Unit13We'retryingtosavetheearth!SectionA3GrammarFocus-4cPayattentiontothesentences.1.We’retryingtosavetheearth.2.Theriverusedtobesoclean.3.Theairisbadlypolluted.4.Noscientificstudieshaveshownthatsharkfinsaregoodforhealth.5.Weshouldhelpsavethesharks.PresentprogressiveusedtoPassivevo
2、icePresentperfectGrammarFocusModalverbs现在进行时:PresentProgressive结构:be(am/is/are)+v.-ing标志词：Look,Listen,now,rightnow…e.g.Look!Theboyiscrying.定义：表示说话时(瞬间)正在进行的动作,也表示目前或现阶段正在进行的动作。Whatafinedaytoday!Look!Whataretheydoing?Exerciseusedtodosth.表示过去常常做某事,而现在往往不做了,后接动词原形。beusedtodoingsth.表示习惯于做某事e
3、.g.Iusedtogetupatsixo’clock.Joeisusedtodrinkingacupofcoffeeeverymorning.usedtodo与beusedtodoingTranslation.1.她过去常常周末和朋友闲逛。Sheusedtohangoutwithfriendsonweekends.2.他习惯于每天晚上睡得很晚。Heisusedtostayingup.Exercise被动语态：Passivevoice定义：表示主语是动作的承受者，即行为动作的对象的一种语态。结构：be+过去分词e.g.Anewschoolwasbuiltlastyear
4、.Ourclassroomiscleanedeveryday.TranslatethesentencesbyusingPassivevoice.1.刚才一些老年人参观了博物馆。2.工人们使用不同种类的机器工作。Themuseumwasvisitedbysomeoldpeoplejustnow.Differentkindsofmachinesareusedtoworkbytheworkers.Exercise结构:has/have+过去分词标志词：already,yet,ever,never,since,for…e.g.Ihaven’tfinishedmyhomework
5、yet.定义：表示动作已经完成,但对现在造成影响;或者表示从过去某一时间开始一直延续到现在并还可能持续下去的动作。现在完成时:PresentPerfectCompletethefollowingsentences.I_________(be)inBeijingfortwoyears.2.I_____never_____(hear)ofthatmanbefore.3.Tom__________(work)theresincetwoyearsago.havebeenhaveheardhasworkedExercise4.Thetwins___________(wash)th
6、eclothesforanhour.5.He_________(play)basketballsincethreeyearsago.6.Howlong____Sally_____(sing)yet?havewashedhasplayedhassung1.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2.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
7、有过去式形式,可用来表达更加客气、委婉的语气。e.g.Kencanclimbupthetresslikeakoala.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。ExerciseWecan’teatintheclassroom.Youmustfinishyourhomeworkfirst.Hec
