北师大初中英语九上《Unit 4 Inventions and Inventors》PPT课件 (3).ppt
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1、Unit 4 Inventions and Inventors,一、本周教学重点:1. 复习被动语态2. 情态动词表达怀疑、确定和可能。3. 重点词汇,二、具体内容:(一)被动语态:1. 一般现在时被动语态基本结构:主语am/is/are过去分词The food is placed in the oven.They are turned into heat.,2. 一般过去时被动语态基本结构:主语was/were过去分词Magic Squares were invented in China.Papermaking was introduced into Japan in 610.3. 情态动
2、词被动语态基本结构:主语can/should/mustbe过去分词School uniform must be worn at all times.,4. 一般将来时被动语态基本结构:主语willbe过去分词It cant be a radio because its too big to be a radio.The report will _ (finish)in two days time.Milk should _ (keep)in the fridge.White clothes and colored clothes should not _(wash)together.Schoo
3、l uniforms neednt _(wear)at all times.,(二)情态动词:当不是很确定时,用might或may. (might比may更不确定)Who knows what will happen. You may even have married by then.It might be a tool for cutting things. I dont know.当确定某件事是唯一的可能时,用must.It must be some sort of toy.当确信不可能发生时,用cannot.It cannot be a radio because its too bi
4、g to be a radio.,Ex. Complete the sentences with might be / may be, cannot be, or must be.1. This exam _ too difficult for the students. I dont think they can finish it.2. It _ a book for children. There are many cartoons in it.3. It _ true. I think you made a mistake. 4. Mr. Smith _ in London, Pari
5、s, or Tokyo. No one knows for sure. 5. That _ John. He is in New York now.6. Did you hear the doorbell? It _ Nicholas. I am expecting him.,(三)重点词汇:1. In many big cities in the world, the overuse of cars is thought to be one of the major causes of air pollution.over名词/形容词,表示“过多,过于”The over-load truck
6、 caused a serious road accident.She always works overtime, so she has to leave her baby cared for by her mother.be thought to be 被认为,被看作She is thought to be the top student in our class.Jane is thought to be busy preparing for the exam.,2. However we are also warned not to ask for pretty colors, bec
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