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1、第1页/共51页Reusemeans“_”.Thoughpollutionisheavynow,Idontthinkitshopeless.useagainuseagain第2页/共51页Makenewwords.JointhepartsofwordsinBoxAwiththewordsinBoxB.Youneedtousesomeofthepartsmorethanonce.Aable-fulim-lessre-un-B care collect hope possible use usual wanted wastecollectable,usable,careful,hopeful,us
2、eful,wasteful,impossible,careless,hopeless,useless,reuse,unusual,unwanted第3页/共51页Nowworkingroups.PlaytheguessinggameEnglish for Fun.1.full of care _2.can be collected _3.full of hope _4.without any hope _5.not possible _carefulcollectablehopefulhopelessimpossible第4页/共51页6.not usual _7.without any us
3、e _8.use again _9.not wanted _10.making a lot of waste _unusualuselessreuseunwantedwasteful第5页/共51页Sometimesifyouknowthemeaningofthepartsofaword,youcanworkoutthemeaningofthewholeword.re+new+able;re=again,able=canberenewable=canbenewagain第6页/共51页1.合成法将两个或两个以上独立且语义不同的单词合在一起构成新词的方法叫做合成法。合成法是一种比较灵活的构词方法
4、，可以合成名词、形容词、副词、代词、动词等。例如：afternoon,sportsman,blackboard,sportsperson,newspaper,第7页/共51页airplane,classmate,grandfather等就是通过合成构词法构成的名词；kind-hearted,middle-aged,hard-working等为合成形容词；however,maybe,himself,everyone,nothing,overlook等也都是通过合成法构成的单词。第8页/共51页2.派生法通过在词根前面加前缀或在词根后面加后缀构成一个新词的方法叫作派生法。要通过派生法理解和记忆单词
5、,我们需要掌握常见的前缀和后缀及派生规律。第9页/共51页(1)常见前缀前缀前缀含义含义例词例词dis-不不disagree,dislikeen-使使处于某种处于某种状态状态enable,enrichim-,in-不不impossible,impatient,inexpensiveinter-在在之间之间,相相互互international,interconnect第10页/共51页前缀前缀含义含义例词例词mis-错误地错误地mislead,misunderstandnon-不不,非非non-smoker,non-nativere-再再,重复重复rewrite,retellun-不不unabl
6、e,unhappy,unpopular第11页/共51页(2)常见后缀后缀后缀功能功能例词例词-er,-or构成名词构成名词teacher,worker,visitor-ianmusician-ingbuilding,painting,shopping,meaning-istartist,scientist第12页/共51页后缀后缀功能功能例词例词-ment构成名词构成名词agreement,government-nesscoldness,happiness,illness-thtruth,warmth-tioncompetition,education,information,invitat
7、ion-tyactivity,safety第13页/共51页后缀后缀功能功能例词例词-able,-ible构成构成 形容词形容词comfortable,eatable,enjoyable,possible,-alenvironmental,international,national,traditional-fulcareful,helpful,useful-iveactive,expensive-lesscareless,helpless,homeless,useless第14页/共51页后缀后缀功能功能例词例词-ly构成构成 形容词形容词friendly,lovely,monthly,we
8、ekly-ousdangerous,famous-teen构成数词构成数词eighteen,fifteen,seventeen-thfifteenth,fifth,fortieth,seventh-tyforty,sixty,twenty-ly构成副词构成副词badly,carefully,carelessly,happily,quickly第15页/共51页(3)派生规律由一个词根加上相应的词缀可以派生出名词、形容词、副词等，掌握派生规律对扩充词汇有很大帮助。例如：由interest可以派生出：uninterestinginterestinterestinginterestinglyinte
9、resteduninterested第16页/共51页由help可以派生出：helplesshelplesslyhelphelpfulhelpfully由able可以派生出：enableableunableabilitydisable第17页/共51页3.转化法英语构词法中把一种词性转化为另一种词性而词形不变的方法称作转化法。常见的转化有：(1)动词转化为名词Letstalkaboutitmore.咱们再谈谈这件事吧。Ithinkwedbetterfinishthetalknow.我想我们最好现在结束谈话。第18页/共51页(2)名词转化为动词Shegavemeacupofwater.她给了我
10、一杯水。Youshouldwatertheflowerstwiceaday.你应该每天给这些花浇两次水。第19页/共51页(3)形容词转化为名词Shewaswearingablackdress.她穿着一条黑色的裙子。Thegirlinblacklooksverybeautiful.那个穿黑衣服的女孩看上去很漂亮。第20页/共51页Completethesentenceswiththewordsinthebox.hopefulimpossiblereuseunhealthywasteful1.Polluted water is _.2.It is _ to throw so much food
11、away.unhealthywasteful第21页/共51页3.If you look after things well,you may _ some of them later.4.It is _ to clean up the whole river in such a short time.5.If we pay attention to pollution now,the future will be _.reuseimpossiblehopeful第22页/共51页Completethetable.NounVerbAdjectiveAdverb useful/uselesshop
12、ehopefully/hopelesslypollutionwaterwasteusually/unusuallyuseuseusefully/uselesslyhopehopeful/hopelesspollutepolluted/unpollutedwaterwastewasteful/wastedwastefullyusual/unusual第23页/共51页CompletethesentenceswiththecorrectformofthewordsinActivity3.She was hopeful that her new job would make her more suc
13、cessful.1.The factory _ the river,and the fish died.2.We often walk in the countryside.It is a(n)_ activity for us.pollutedusual第24页/共51页3.Do not use so much water.It is very _.4.To keep the flowers growing,you need to _ them once a day.wastefulwater第25页/共51页Completethesentences.A lunchbox is a box
14、that you keep your lunch in.1.A _ is a card that you write on one side of and send to someone by post.2.A _ is a room where you have classes at school.postcardclassroom第26页/共51页3.A _ is a book that has one or more stories for children.4.A _ is a black board that is used at school for writing on with
15、 chalk.storybookblackboard第27页/共51页Lookatthepicturesandanswerthequestions.第28页/共51页1.What kinds of things can be recycled?2.How can these things be reused?3.How does this help the environment?4.Have you ever recycled or used things that can be recycled?How?第29页/共51页Completetheconversationwiththecorr
16、ectformoftheexpressionsinthebox.begoodforthrowawayturnoffworryabout第30页/共51页Mike:IhearyouareofftotheCaribbeanforaholiday!Luckyyou!Butarentyou(1)_thepollutionthatsuchlongplanejourneymaycausefortheenvironment?Ken:Iknow,butwhatcanIdoaboutit?Ivealreadytriedmybesttoprotecttheenvironment.worriedabout第31页/
17、共51页Irecycle.Idont(2)_thingsifIdontwantthemanymore.I(3)_thelightswhenIleavearoom.DonttellmeIshouldnttravelbyplaneanymore!throwawayturnoff第32页/共51页Mike:No,ofcoursenot.Butwecandomoretoprotecttheenvironment.Forexample,wecanhelpkeeptheaircleanbyplantingtrees.Trees(4)_theenvironment.Inthisway,wecanreduce
18、theharmofpollution.aregoodfor第33页/共51页Ken:Good!SoIcanenjoymyholiday,andwhenIcomeback,Illplantsometrees!Mike:Thatstheidea!Maybewecanalljoininandstartasmallforest!第34页/共51页Listenandcheck()thetruesentences.1.It is OK to throw used things away.Looking after them takes a lot of time.2.Do not throw away t
19、hings made of glass,plastic and paper,but recycle them when possible.3.Take a bag when you go shopping.第35页/共51页4.Producing electricity and using oil will not cause pollution.5.Turn off lights when you do not need them.6.Ride a bike or walk,and do not often drive your car.第36页/共51页Listenagainandcomp
20、letethetable.Advice Reasons 1.Dont throw away things made of _,but _ them.Throwing things away is wasteful.2._ your plastic bags when you can and _ with you when you go shopping.Plastic bags _ recycle.glass,plasticandpaperrecycleReusetakeabagarehardto第37页/共51页Advice Reasons 3.Use less electricity an
21、d oil to _.4.Dont leave lights on and _.5._ and do not often drive your car.Producing electricity and using oil may cause _.reducepollutionwasteelectricityWalkorcyclepollution第38页/共51页EarthHour第39页/共51页Readthepassageandanswerthequestions.WhenisEarthHourheldeachyear?EarthHourisheldtowardtheendofMarch
22、eachyear.WhydopeopleswitchoffthelightsduringEarthHour?Theydothistoshowtheirawarenessofclimatechange.第40页/共51页WhenandwherewasthefirstEarthHourheld?ThefirstEarthHourwasheldin2007inSydney.第41页/共51页Whichcitytakepartintheeventtoday?Moreandmorecitiesaretakingpartintheevent,suchasBeijing,London,RomeandNewY
23、ork.第42页/共51页Workingroups.Decidewhatkindofpollutionyouwanttotalkabout.第43页/共51页Choose a subject that you care about the most.It could be water pollution,air pollution,etc.Find out more information about your subject.Look it up on a website or in a book.第44页/共51页If you choose air pollution,lets watch
24、 a video about air pollution from a factory.第45页/共51页Do you know PM 2.5?Lets know more about PM 2.5 and protect the environment from now.第46页/共51页Discussyoursubject.Take turns to say what you think about the problem and what can be done.第47页/共51页Listen to what others say.If you agree with what they
25、have said,say“I agree”.“Thats true”or“Thats a good point”;if you do not agree with what someone says,say“Im sorry,but I dont agree.I think that”Presentyourgroupideastothewholeclass.第48页/共51页假如你校将于下周五下午举办一场以环保为主题的英语演讲比赛。请你根据下面的要点提示写一篇100词左右的演讲稿，参加此次比赛。要点提示：1.尽量选择绿色出行方式；2.购物时携带自制购物袋；3.节约水电；4.循环再利用废品。第49页/共51页第50页/共51页感谢您的观看！第51页/共51页