文档介绍：Unit 3 English Around the World Section A Topic 1 Enjoying a song (歌曲) es from America. He is American. English is spoken by him. He speaks English. She is from China. She is Chinese. She speaks Chinese. Chinese is spoken by her . Americans speak English . English is spoken by Americans . 被动语态被动语态 The air is polluted by many factories. Many factories pollute the air. Computers are used by children. Children use computers. The Great Wall is visited by many people. Many people visit the Great Wall. 3. More and more poor children ____________ by the kind lady in the future. (help) . 1. Everyone _________ to protect the environment every day. (call) far, many difficult problems in the school __________________ by the headmaster. (solve) have been solved Practice 用所给词的正确形式填空 2. Two trees ____________ by the student yesterday. (plant) were planted will be helped 观察: be 动词有______,_______ 和_______ 的变化时态人称数 is called 各种时态的被动语态 am/is/ are + was/were + will +be+ am/is/ are +being + was/ were +being + have/has +been + Pair work. ?D iscuss in pairs to find out how to change the active voice into the passive voice. T hen make more sentences .