Unit2Topic2SectionA课件九年级英语上册

Unit2SavingtheEarthTopic2Pollutionhascausedtoomanyproblems.SectionALanguagegoalsRevision：一般过去时和现在完成时的用法区别一般过去时现在完成时用法连用的词和短语表示过去发生或已完成的动作对现在的影响或产生的结果（与现在无关）表示过去发生的动作或存在的状态（与现在无关）yesterday,last+时间名词,时间段+ago,in2005,inthepast,justnow…

for+时间段,since,recently,sofar,already,yet,just,ever,never,beforeinthepast+时间段,()()()()()()415362washtheearthawaymanytreeschangeintodesertforestsgonecutdowntrees1.Theboyandgirlsaretalkingabout___________.differenttypesofsandstormsthereasonsforsandstormssandstormsindifferentcities2.What’stheweatherliketoday?

3.Whatcausesthesesandstorms?

4.Dowestillneedtodosomethingtoprotecttheenvironment?

1bListento1aandchoosethebestanswer.BIt’sbad.Thewindissostrong.Andthesandreallyhurtsface.Peoplehavecutdowntoomanytrees.Asaresult,alotofrichlandhaschangedintodesert.Yes,wedo.Althoughwehavebuilt“TheGreenGreatWall”,westillneedtodosomethingtoprotecttheenvironment.Tree’sfunctions

A.Treescanstopthewindfromblowingtheearthaway.B.lotofwatercanbesavedbyforests.C.Theycanalsostopthewaterfromwashingtheearthaway.Keypoints

1.when表示“当......时候”+延续性v./短暂性v.while表示“当......时候”只能+延续性v.eg.1.When/WhieMargowastalkingonthephone,hersisterwalkedin.2.CindywaswearingapinkshirtwhenIsawhim.▲while“然而”，表对比;“一边---，一边---”，表示两个动作同时发生。2.change...into=turn...into把......变成......3.stopsb.(from)doingsth.阻止某人做某事=preventsb.(from)doingsth.=keepsb.fromdoingsth.▲keepsb.doingsth.让某人一直做某事4.cutdown“砍倒”代词放中间5.anumberof“许多”(修饰主语，谓语当做复数）thenumberof“......的数量”(作主语，谓语用单数）Keypoints

▲

用what’s来提问，用large/small来修饰。eg.1.Anumberofstudents__________(have)thesameproblem.2.Thenumberofthestudentsinourschool______(be)over3,000.6.blow…away吹走wash…away冲走eg.1.Thewindwillblowtheearthaway.2.Alotofwaterwillwashtheearthaway.7.although引导让步状语从句，意为“尽管，即使”，可换为though/eventhough,其后句中不能出现but。eg.Althoughthereweresandstormsbefore,nowwehavebuilt“TheGreenGreatWall"8.V-ing作主语，谓语动词用单数eg.Cuttingdowntreesaffectstheweathersomuch.9.beharmfulto=doharmto对...有害10.beindanger(of)处于(…的)危险中haveisKeypointsUsesomeone,something,anything,somewhere,anywheretofillintheblanks.somethingsomeone

anythingsomewhereanywhereasaresult,changeinto,dosomething,stop…from,blow…away

haschangedintoblowsawaydosomethingstopfromAsaresult2.Completethesentenceswiththecorrectformsofthegivenphrasesinthebox.

4.A.Listentothepassageandcirclethephrasesyouhear.

B.Listenagainandfillintheblanks.doourbest

indangerofplentyoffewerandfewer1.刚才2.变成/转换成3.阻止某人做某事4.对......有影响5.把......冲掉/洗掉(吹走，带走）6.许多（谓语v.用复数）7.......的数量（谓语v.用单数）11.对...有害12.开始存在，产生13.处于(…的)危险中15.足够的，大量的ExercisesinclassExercisesinclassBCABDBDBDSummaryWelearn:1.Somewords:sand,although

2.Somephrases:changeinto,humanbeing

3.Somesentences:

(1)Asaresult,alotofrichlandhaschanged

intodesert.

(2)Treescanstopthewindfromblowingtheearthaway.

Wecan:1.Usetheindefinitepronounandadverb.

2.Talkaboutthesandstormanditsharm.