Reuse means “use again”. Though pollution is heavy now, I don’t think it’s 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 waste collectable, usable, careful, hopeful, useful, wasteful, impossible, careless, hopeless, useless, reuse, unusual, unwanted

Now work in groups. Play the guessing game English for Fun. 1. full of care ____________ 2. can be collected ____________ 3. full of hope ____________ 4. without any hope ____________ 5. not possible ____________ careful collectable hopeful hopeless impossible

6. not usual ____________ 7. without any use ____________ 8. use again ____________ 9. not wanted ____________ 10. making a lot of waste ____________ unusual useless reuse unwanted wasteful

Sometimes 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 again

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，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, dislike en- 使 …… 处于某种 状态 enable, enrich im-, in- 不 impossible, impatient, inexpensive inter- 在 …… 之间, 相 互 international, interconnect

前缀含义例词 mis- 错误地 mislead, misunderstand non- 不, 非 non-smoker, non- native re- 再, 重复 rewrite, retell un- 不 unable, unhappy, unpopular

(2) 常见后缀 后缀功能例词 -er, -or 构成名词 teacher, worker, visitor -ianmusician -ing building, painting, shopping, meaning -istartist, scientist

后缀功能例词 -ment 构成名词 agreement, government -ness coldness, happiness, illness -thtruth, warmth -tion competition, education, information, invitation -tyactivity, safety

后缀功能例词 -able, -ible 构成 形容词 comfortable, eatable, enjoyable, possible, -al environmental, 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 -th fifteenth, fifth, fortieth, seventh -tyforty, sixty, twenty -ly 构成副词 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： uninteresting interest — interesting — interestingly interested — uninterested

由 help 可以派生出： helpless — helplessly help — helpful — helpfully 由 able 可以派生出： enable able unable ability disable

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 — Let’s talk about it more. 咱们再谈谈这件事吧。 — I think we’d better finish the talk now. 我想我们最好现在结束谈话。

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 — Let’s talk about it more. 咱们再谈谈这件事吧。 — I think we’d 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 looks 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. It is _________ to throw so much food away. unhealthy wasteful

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 __________. reuse impossible hopeful

Complete the table. NounVerbAdjectiveAdverb useful/useless hopehopefully / hopelessly pollution—— water—— waste —— usually/ unusually use usefully/ uselessly hope hopeful/hopeless pollute polluted/unpolluted water waste wasteful/wasted wastefully usual/ unusual

Complete 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. We often walk in the countryside. It is a(n) _______ activity for us. polluted usual

3. Do not use so much water. It is very __________. 4. To keep the flowers growing, you need to _________ them once a day. wasteful water

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 possible. 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. AdviceReasons 1. Don’t 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, plastic and paper recycle Reuse take a bag are hard to

AdviceReasons 3. Use less electricity and oil to _______________. 4. Don’t leave lights on and _______________. 5. ____________ and do not often drive your car. Producing electricity and using oil may cause ___________. reduce pollution waste electricity Walk or cycle pollution

Earth Hour

Read 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 this 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 kind 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, let’s watch a video about air pollution from a factory.

Do you know PM 2.5? Let’s 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”. “That’s true” or “That’s a good point”; if you do not agree with what someone says, say “I’m sorry, but I don’t agree. I think that …”

1.When are you going to write about ____________ (environment) education? 2. If we don’t, the future is ___________. (hope) 3. It’s ____________(waste) to throw away paper and metal. 4. __________(use) means “use again”. 5. Every class collects ___________(use) waste. Complete the sentences with the correct form of the words. environmental hopeless wasteful Reuse reusable