(
课件网) Unit 3 Language in use Module 12 Save our world Language practice Reuse means “use again”. Though pollution is heavy now, I don’t think it’s hopeless. Make 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. 1 -able -ful im- -less re- un- A B care collect hope possible use usual wanted waste 构词法 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, airplane, grandfather等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 也都是通过合成法构成的单词。 新课讲授 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, 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 Summarize the rules of prefix and suffix word-formation. 派生法是英语主要的构词法。这方法是借前缀或后缀产生出派生词，主要有名词、形容词和动词三种。前缀以否定前缀un-、in-、im-、il-、ir-、non-、dis-、mis-等为主，使单词延伸出来的派生词变成其反义词。例如：injustice(不公平的)、unhappy(不高兴的)、impossible(不可能的)等。 (1)名词派生词 balance(平衡)→imbalance(不平衡)；pleasure(高兴)→displeasure(不高兴)； management(管理)→ mismanagement(管理不善)； efficiency(功效)→inefficiency(无效率)等。 Summarize the rules of prefix and suffix word-formation. (2)形容词派生词 accurate(精准，正确)→inaccurate(不正确)； patient(能忍耐的)→impatient(无法忍耐的)； regular(有规矩的)→ irregular(不规矩的)； legal(合法的)→illegal(违法的)等。 (3)动词派生词 agree(赞同)→disagree(不赞同)；judge(判断)→misjudge(对……判断错误)； treat(款待)→mistreat(虐待)等。 新课讲解 4 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. 3．Do not use so much water. It is very_____． 4．To keep the flowers growing, you need to _____ them once a day. polluted usual wasteful water 新课讲解 5 Complete 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. A _____ is a room where you have classes at school. 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 chalk. postcard classroom storybook blackboard 2. 表示 “再”的前缀： re- rewrite, reuse, recycle 3. 表示 “错误地”的前缀： mis - mislead , misunderstand 4. 表示 “在……之间，相互”意思的前缀： inter- 表示“在……之间，相互” ... ...
