英语：Unit2 Plant a Plant Lesson 13课件2(冀教版八年级下).ppt

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1、Lesson13:Whyareplantsimportant?MewwordsThinkaboutittextprojectNewwordsairn.空气shaden.　树荫nothingpron　没有东西.diev.　　死energyn.　能量heatn.　热；　ｖ.加热bamboon.　竹子kilogramn.　千克ThinkaboutitAretherealotoftreeswhereyoulive?Whyorwhynot?Whydoweneedtrees?Whatkindofthingscanplantsdo?Weneedtrees

2、J:Let’stalkabouttreesandwhyweneedthem.Treeshelpcleantheair.Theygiveusfood–likeapples,bananasandoranges.D:Howaboutdonuts?Iwanttoplantadonuttree!B:Donutsdon’tgrowontrees!Butwecanmakeandbuildthingswithtrees–likechairs,bedsandhouses!D:Sometimestheweatherissunnyandhot.Thenwecans

3、itunderatreeintheshade.J:Wemakebooksfromtrees.Also,manyanimalsliveintrees.DLDoplantsdootherthings?B:Plantscoverthesoil.Thenthewindandwaterdon’tcarrythesoilaway.J:Allplanttakeenergyfromthesunandmakeitintofood.Peopleandotheranimalsneedthefoodtolive.Withoutfood,theywouldhaveno

4、thingtoeatandtheywoulddie.B:Whatisenergy?Lightisenergy.Heatisenergy.D:Ineedfoodtolive.Dinosaursneedalotoffood!Theyneedalotofdonuts!Someanimalseatonlyoneplant.Pandaseatbambooonly.Bigpandaseateighteenkilogramsofbambooeveryday!Project:doweneedplants?Yes,weneedplants.Everyonekn

5、owsthat!Butwhydoweneedthem?Findthreeanswerstothisquestion.Writedownyouranswers.1_________________2__________________3___________________Let’stalkabouttreesandshyweneedthem.我们讨论树和我们为什么需要树。Let’s=Letus意为“让我们”，let是动词，us做let的宾语，该句型结构为letsb.dosth.“让某人做某事”。表示说话人的建议，对该句型的肯定回答一般用“OK

6、”“Allright.”“Yes,let’s…”。其否定回答用”Sorry,I…”。--Let’shaveacupoftea.–OK.我们喝杯茶吧。好吧。--Let’ssingABCsong.–Sorry,Ican’tsingit.我们唱字母歌吧。对不起，我不会唱。Treeshelpcleantheair.树能帮着清洁空气。helpvt.帮助，常用于两个句型：helpsb.(to)dosth.和helpsb.withsth.都有“帮助某人做某事”之意。介词with后接名词，通常不接动词-ing形式。Mr.Wuhelpsme(to)learnE

7、nglish.=Mr.WuoftenhelpsmewithmyEnglish.吴先生帮我学英语。Howaboutdonuts?面包圈怎么样？Howabout…?=Whatabout…用于向对方提出一个建议，或征求对方的意见，后接名词或动词-ing形式。也可用于询问对方或第三者与情景有关的各种情况。How/Whataboutacupoftea?来杯茶好吗？How/Whataboutgoingforawalkaftersupper?晚饭后出去散步好吗？I’mfine.How/Whataboutyou?我身体很好，你呢？Donutsdon’tgro

8、wontrees!树上不结面包圈。ontrees在树上辨析：onthetree(ontrees)与inthetree(intrees)两者都表示“在树上”，用in时