《九年级英语unit9课件.ppt

Unit 9 When was it invented? The passive voice 被动语态 在被动语态的句子中, 谓语部分的结构是be + 过去分词。被动语态的句子的时态变化反映在be动词上。也就是说, 把一个句子做成被 动语态的句子, 只需要写出be动词 的所需时态, 再加上所给动词 1. 世界上许多国家都讲英文。 English is spoken in many countries all over the world . 　　 　 2. 纸是中国发明的。 Paper was invented in China. 3. 这栋大楼是去年建造的。 The building was built last year. 一、用动词的适当形式填空 A: What 1 (do) you think is the most helpful invention ? B: I think the most helpful invention 2 (be) the light bulb. A: Why 3 (be) that ? B: Well ,it 4 (give) people more time 5 (work) and play every day. 6.____ a new library ______ ( build ) in our school last year ? 7.Cotton __________ ( grow) in the southeast of China. 8. How many trees ____ ____________(plant) yesterday? 9.Your shoes ______________ (wear) out .You need a new pair. 10.When _____ this kind of computers _____ (use) ? Two years ago. 1.invent (名词,表示人) __________ 2.invent (名词,表示物)___________ 3.legend (形容词) ___________ 4.mix (名词,表示物 )__________ 5.although(近义词)_______ 6.leaf (复数)________ 7.crisp (形容词)_______ 8.please (形容词) _________ 9.slight (副词)_________ 10.salt (形容词) __________ 11.abacus (复数)________________ 12.mistake (形容词) __________ 13.sweet (反义词) _____________ 14.thin (比较级)_________ B: It is an alarm clock. A: What is it used for? B: It is used for waking people up in the morning. A: Do you think it is annoying? B: Sometimes, when I want to go on sleep. Dialogue 2: B: It is a light bulb. A: What is it used for? B: It is used for giving light. A: Do you think it is helpful? B: Yes, I think so. Because I always do homework and read books in the evening by its light. Dialogue 3: B: It is a microwave oven. A: What is it used for? B: It is used for heating cold food and cooking meals. A: Do you think it is helpful? Helpful inventions: vacuum cleaner, soundproo