英语：Unit 4 Inventions and Inventors复习课件（北师大版九年级）.pptVIP

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. 情态动词被动语态基本结构： 主语＋can/should/must＋be＋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＋will＋be＋过去分词 It can’t be a radio because it’s 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. School uniforms needn’t ______（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 don’t 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 it’s too big 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 don’t 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, Paris, 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 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, because the car will come in gray only. warn No one warned him of the danger. I warned her not to ge