高中英语外研版必修三Unit3 现在完成时的被动语态

该高中英语课件聚焦现在完成时的被动语态，通过Lead in环节的四个例句引导学生自主发现时态与语态特征，以观察定义、总结结构、转换练习等为学习支架，构建从被动语态基础到现在完成时具体用法的连贯知识脉络。 其亮点在于以活动驱动学习，通过小组合作填写时态结构表、四步转换法总结规则、实例分析用法标志词等，培养学生语言能力（如主动被动转换练习）、思维品质（结构归纳与用法辨析）和学习能力（分层作业设计）。学生能在实践中掌握语法，教师可借助清晰的知识框架提升教学效率。

Unit 3 Using Language 高中英语外研版必修三 现在完成时的被动语态 Lead in:Read again and find out 1. Important advances have been made in medicine and environmental science. 2. New inventions like 3D printers have been used to make replacement hearts and bone parts. 3. Benjamin Franklin's famous experiment has been introduced to generations of children. 4. It has been proved that Franklin's experiment took place. 这些句子都在描述过去发生、对现在有影响的动作，时态是什么？ 动作的执行者没有重点强调，侧重事物被怎么样，是什么语态？ 现在完成时的被动语态 Activity1：Observe and answer ① Lightning was produced by electricity. ② New inventions like 3D printers have been used to make replacement hearts. ③ The story of Franklin’s experiment is taught in schools. （2）All these sentences use passive voice. Summarize the definition of passive voice: Passive voice shows that the subject is the ____________of an action. It is usually used to describe scientific experiments, inventions and phenomena objectively. They are receivers of the actions. receiver Task 1: Observe the bold parts and answer the questions. （1）Do the subjects above act as doers / receivers of the actions? (3) Basic passive voice: be + past participle Activity2：Summarize the structure Work in groups. Fill in the passive voice structure of each tense. 时态 被动语态结构 例句 一般现在时 The experiment is studied widely. 一般过去时 The kite experiment was done in 1752. 一般将来时 New tools will be invented soon. 现在进行时 A new robot is being tested now. 过去进行时 The machine was being repaired then. 现在完成时 Advances have been made in science. 过去完成时 The data had been collected before the test. am/is/are + done was/were + done will be + done am/is/are being + done was/were being + done have/has been + done had been + done Activity3：Learn by transforming Finish the active-passive voice transformation exercises and summarize the conversion rules. Scientists invent new tech every year.（主动） →_________________________________________________（被动） People saw Franklin do the kite experiment.（主动） →_______________________________________（被动） The expert gave us scientific data.（主动） → _______________________________________（被动） New tech is invented by scientists every year. Franklin was seen to do the kite experiment. We were given scientific data by the expert. Summary: Four Steps of Voice Transformation Object becomes ____________(Change the object into the new _____________ ) 01 Add “_____” phrase (Use “____” to introduce the original subject, which can be omitted) 03 Change verb form (Change the predicate into “________________________” and match the correct tense) 02 Adjust the word order to make the sentence correct and smooth. 04 subject subject be + past participle by by Activity4：Analyze the given sentences and summarize He has been selected to take part in the sports meeting. The ink has not been removed from the clothes. Has your computer just been attacked by a virus? How long have you been employed at this job? 肯定句式 主语+___________________ +过去分词（+其他） 否定句式 主语+_______________________+过去分词（+其他） 一般疑问句式 __________________ + 主语 + ____________ + 过去分词（+其他）？ 特殊疑问句式 疑问词+________________+主语+ _________________+过去分词（+其他）？ have/has been have/has not been Have/has been have/has been 例句 用法 标志词 The problem has already been solved. Financial problems of the company have been discussed for nearly two hours. Don’t drink the water until it has been cooled. — This is the first time Tom has been invited to perform on the stage. 表示过去的动作对现在造成的影响或结果 表示一个被动的动作从过去开始一直持续到现在，并有可能持续下去 用在时间或条件状语从句中，用现在完成时的被动语态代替将来完成时的被动语态。 表示过去的经历 already, yet, just for, since, how long ever, never, before, so far 补充标志词：in recent years, over the past few years, by now Activity5：Make sentences and share Create 2 correct sentences with present perfect passive voice about science, inventions or experiments and share in groups Many new medical technologies have been developed in recent years. The truth of Franklin’s experiment has been further studied by scientists. Activity6：Make a summary by filling in notes Definition of passive voice The subject is the receiver of the action. Basic structure be + past participle Transformation rules object to subject, active to passive, original subject introduced by “by” present perfect passive voice Structure: have/has been + past participle Usages: showing results, duration, past experiences, future completed actions in clauses Summary Homework Basic: Complete your knowledge notes and memorize the structure & signal words of the present perfect passive voice. Improvement: Collect 5 passive voice sentences from the two unit texts and mark their tenses. Extension: Write 5 sentences about a scientific invention using the present perfect passive voice. $