英语人教版九年级全册unit13 period3.ppt

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1、Unit13Unit13We'retryingtosavetheearth!SectionA3GrammarFocus-4cRevision不同种类的污染2.河底3.把垃圾扔到河里4.在……中起作用differentkindsofpollutionthebottleoftheriverthrowrubbishintotheriverplayapartinI.Checkifyouknowthesephrases.5.在中国南部6.对……有害7.在……顶部8.海洋生态系统insouthernChinabeharmfultoattheto

2、poftheocean’secosystemII.Translatethesentences.1.甚至是河底都满是垃圾。2.这个方法不仅残酷还对环境有害。Eventhebottomoftheriverwasfullofrubbish.Thismethodisnotonlycruel,butalsoharmfultotheenvironment.3.鲨鱼处于海洋食物链的顶部。4.许多人相信鱼翅对健康有好处。Sharksareatthetopofthefoodchainintheocean’secosystem.Alotofpeople

3、believethatshark’sfinsaregoodforhealth.Payattentiontothesentences.1.We’retryingtosavetheearth.2.Theriverusedtobesoclean.3.Theairisbadlypolluted.4.Noscientificstudieshaveshownthatsharkfinsaregoodforhealth.5.Weshouldhelpsavethesharks.PresentprogressiveusedtoPassivevoiceP

4、resentperfectGrammarFocusModalverbs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。beusedtodoi

5、ngsth.表示习惯于做某事e.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+

6、过去分词e.g.Anewschoolwasbuiltlastyear.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,ye

7、t,ever,never,since,for…e.g.Ihaven’tfinishedmyhomeworkyet.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)theresincetwo

8、yearsago.havebeenhaveheardhasworkedExercise4.Thetwins___________(wash)theclothesforanhour.5.He_________(play)basketba