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1、Module 12 Save our world,Unit 3 Language in use,在一个单词前或后加上一个词缀，就可以构成一个新词。根据词缀的位置，分为前缀和后缀两种。掌握一些常见的词缀，对单词的记忆和理解有很大的帮助。比如：我们学会care， 就能掌握careful， careless， carefully， carelessly。下面我们来学习几个常见的前、后缀：,Grammar,1. 表示否定意义 “无，不”的前缀：,impolite, impossible,un- in- dis- im- il-,unfair, unhappy,inactive, inhuman, in
2、direct,disagree, disappear,illegal,前缀：,2. 表示程度、大小的前缀：,super- over- mini- under-,superstar, supermarket, superman, superpower,overhead, overeat, overuse,minibus, miniskirt, minicar,underground, underdevelop,前缀：,3. 表示 “再”的前缀：,re-,rewrite, reuse, recycle,前缀：,4. 表示 “向，背”的前缀：,pro- anti-,pro-Chinese, pro-
3、American,anti-war(反战), anti-pollution,5. 表示 “整个、完全”意思的前缀：,al- 表示“完整，完全” ：alone, almost, over- 表示“完全，全” ：overall, overflow(充满),前缀：,able表示“可能，易于，适合于”， 构成形容词，如：renewable, eatable(可吃的)，lovable(可爱的)， comfortable, movable(可移动的),后缀：,常见的后缀：,2. ful 表示“充满.的，具有.性质 的”，构成形容词。 如：helpful, hopeful, powerful ,useful
4、, careful, beautiful,后缀：,3. less 与-ful 相反，表示“少的，不足的”，构成形容词。 如：helpless, hopeless, powerless, useless, careless,1. 动词变名词：,-ation -ment -al -ee -er -or,satisfaction, education, realization,development, movement,arrival, refusal,trainee, employee,teacher, worker,visitor, sailor,让我们来看一些不改变词根的基本意义，而是改变了词
5、性的后缀。,2. 形容词变名词：,-ness -ity -ism,happiness, meanness, carelessness,ability, possibility,Marxism, criticism,3. 名词、形容词变动词：,-ify -ize -en,beautify, simplify,realize,quicken, widen, sharpen,4. 名词变形容词：,-y -ish -some -ous -ful,windy, rainy, sandy,foolish, feverish,handsome, troublesome,dangerous, humorous
6、,helpful, careful, peaceful,Complete the table,electricity,electric,energy,energetic,environmental,hopeless,hope,hope,pollution,polluted,serious,seriously,nation,nationally,unusual,environmentally,waste,worriedly,wastefully,wasteful,worried,worry,Complete the sentences with the correct form of the w
7、ords.,1 They are working very_ to reduce waste. 2 The situation is_. We cant do anything to make it better. 3 The factory_ the river, and the fish died. 4 We dont often walk in the country. Its a(n)_ activity for us. 5 Dont_. Everything will be all right. 6 Dont use so much water. Its very_.,energet
8、ically,hopeless,polluted,unusual,worry,wasteful,Module task,Discuss what you can do about pollution.,Work in groups. Decide what type of pollution you want to talk about.,Choose something that is very important to you. It could be water pollution, air pollution, waste, cutting down forests, etc. Fin
9、d out a bit more information about your subject. Look it up on the website or in books.,Discuss your topic,Take it in turns saying what you think about the problem and what can be done. Listen carefully to what the others say. If you agree with what theyve said, say “I agree”, “Thats true” or “Thats a good point”; if you dont agree, say “Im sorry but I disagree. I think that .” Make a summary of what you have said and tell the class.,
