1、Reuse means“use again”.Though pollution is heavy now,I dont think its hopeless.Make a new words.Join the parts of words in Box A with the words in Box B.You need to use some of the parts more than once.A able -ful im-less re-un-B care collect hope possible use usual wanted wastecollectable,usable,ca
2、reful,hopeful,useful,wasteful,impossible,careless,hopeless,useless,reuse,unusual,unwantedNow work in groups.Play the guessing game English for Fun.1.full of care _2.2.can be collected _3.3.full of hope _4.4.without any hope _5.5.not possible _carefulcollectablehopefulhopelessimpossible6.not usual _7
3、.without any use _8.use again _9.not wanted _10.making a lot of waste _unusual uselessreuseunwantedwastefulSometimes if you know the meaning of the parts of a word,you can work out the meaning of the whole word.re+new+able;re=again,able=can be renewable=can be new again1.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
4、词的方法叫做合成法。合成法是一种比较灵活的构词方法，可以合成名词、形容词、副词、代词、动词等。例如：afternoon,sportsman,blackboard,sportsperson,newspaper,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。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
5、通过派生法理解和记忆单词,我们需要掌握常见的前缀和后缀及派生规律。(1)常见前缀前缀含义例词dis-不disagree,dislikeen-使处于某种状态enable,enrichim-,in-不impossible,impatient,inexpensiveinter-在之间,相互international,interconnect前缀含义例词mis-错误地mislead,misunderstandnon-不,非non-smoker,non-nativere-再,重复rewrite,retellun-不unable,unhappy,unpopular(2)常见后缀后缀功能例词-er,-or构
6、成名词teacher,worker,visitor-ianmusician-ingbuilding,painting,shopping,meaning-istartist,scientist后缀功能例词-ment构成名词agreement,government-nesscoldness,happiness,illness-thtruth,warmth-tioncompetition,education,information,invitation-tyactivity,safety后缀功能例词-able,-ible构成形容词comfortable,eatable,enjoyable,possi
7、ble,-alenvironmental,international,national,traditional-fulcareful,helpful,useful-iveactive,expensive-lesscareless,helpless,homeless,useless后缀功能例词-ly构成形容词friendly,lovely,monthly,weekly-ousdangerous,famous-teen构成数词eighteen,fifteen,seventeen-thfifteenth,fifth,fortieth,seventh-tyforty,sixty,twenty-ly构成
8、副词badly,carefully,carelessly,happily,quickly(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：uninterestinginterest interesting interestingly interested uninterested由 help 可以派生出：helpless helplesslyhelp helpful helpfully由 able 可以派生出：enableable unable ability disable3.转化法英语构词法中把一
9、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 Lets talk about it more.咱们再谈谈这件事吧。I think wed better finish the talk now.我想我们最好现在结束谈话。(2)名词转化为动词She gave me a cup of water.她给了我一杯水。You should water the flowers twice a day.你应该每天给这些花浇两次水。(3)形容词转化为名词She was wearing a black dress.她穿着一条黑色的裙子。The girl in black l
10、ooks very beautiful.那个穿黑衣服的女孩看上去很漂亮。Complete the sentences with the words in the box.hopeful impossible reuse unhealthy wasteful 1.Polluted water is _.2.2.It is _ to throw so much food away.unhealthywasteful3.If you look after things well,you may _ some of them later.4.It is _ to clean up the whole
11、river in such a short time.5.If we pay attention to pollution now,the future will be _.reuseimpossiblehopefulComplete the table.NounVerbAdjectiveAdverb useful/uselesshopehopefully/hopelesslypollutionwaterwasteusually/unusuallyuseuseusefully/uselesslyhopehopeful/hopelesspollute polluted/unpollutedwat
12、erwastewasteful/wastedwastefullyusual/unusualComplete the sentences with the correct form of the words in Activity 3.She was hopeful that her new job would make her more successful.1.The factory _ the river,and the fish died.2.2.We often walk in the countryside.It is a(n)_ activity for us.pollutedus
13、ual3.Do not use so much water.It is very _.4.To keep the flowers growing,you need to _ them once a day.wastefulwaterComplete the sentences.A lunchbox is a box that you keep your lunch in.1.A _ is a card that you write on one side of and send to someone by post.2.2.A _ is a room where you have classe
14、s at school.postcardclassroom3.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 chalk.storybookblackboardLook at the pictures and answer the questions.1.What kinds of things can be recycled?2.2.How can these things be reused?3.
15、3.How does this help the environment?4.4.Have you ever recycled or used things that can be recycled?How?Complete the conversation with the correct form of the expressions in the box.be good for throw away turn off worry aboutMike:I hear you are off to the Caribbean for a holiday!Lucky you!But arent
16、you _ the pollution that such long plane journey may cause for the environment?Ken:I know,but what can I do about it?Ive already tried my best to protect the environment.worried aboutI recycle.I dont _ things if I dont want them any more.I _ the lights when I leave a room.Dont tell me I shouldnt tra
17、vel by plane any more!throw awayturn offMike:No,of course not.But we can do more to protect the environment.For example,we can help keep the air clean by planting trees.Trees _ the environment.In this way,we can reduce the harm of pollution.are good forKen:Good!So I can enjoy my holiday,and when I c
18、ome back,Ill plant some trees!Mike:Thats the idea!Maybe we can all join in and start a small forest!Listen and check()the true sentences.1.It is OK to throw used things away.Looking after them takes a lot of time.2.Do not throw away things made of glass,plastic and paper,but recycle them when possib
19、le.3.Take a bag when you go shopping.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.Listen again and complete the table.Advice Reasons 1.Dont throw away things made of _,but _ them.Throw
20、ing things away is wasteful.2._ your plastic bags when you can and _ with you when you go shopping.Plastic bags _ recycle.glass,plastic and paperrecycleReusetake a bagare hard to Advice Reasons 3.Use less electricity and oil to _.4.Dont leave lights on and _.5._ and do not often drive your car.Produ
21、cing electricity and using oil may cause _.reduce pollutionwaste electricityWalk or cyclepollutionEarth HourRead the passage and answer the questions.When is Earth Hour held each year?Earth Hour is held toward the end of March each year.Why do people switch off the lights during Earth Hour?They do t
22、his to show their awareness of climate change.When and where was the first Earth Hour held?The first Earth Hour was held in 2007 in Sydney.Which city take part in the event today?More and more cities are taking part in the event,such as Beijing,London,Rome and New York.Work in groups.Decide what kin
23、d of pollution you want to talk about.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.If you choose air pollution,lets watch a video about air pollution from a factory.Do you
24、 know PM 2.5?Lets know more about PM 2.5 and protect the environment from now.Discuss your subject.Take turns to say what you think about the problem and what can be done.Listen to what others say.If you agree with what they 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”Present your group ideas to the whole class.
