人教版九年级英语全册Unit 6 When was it invented-被动语态教案

1、 HYPERLINK javascript:showlogin(317829); 九年级英语被动语态Teaching objectives(教学目标):1.Knowlegh objectives (知识与能力)：什么是主动语态(active voice)和被动态(passive voice)，被动语态的时态及用法。2.Emotional objectives (情感价值观)：通过学习，能够用被动语态表达身边发生的事情，激发学生的学习兴趣，热爱生活。Key and difficult points(教学重点和教学难点)：被动语态的基本运用,把主动语态变成被动语态，被动语态的时态及用法。Teach

2、ing method(教学方法)：讲练结合法，比较法，教学生学习使用观察总结运用的学习方法。Teaching tools(教学准备)：多媒体课件 Step 1: lead in. 3 minutesWarming up,chant in class.(热身调动学生的积极性) Step 2: Presentation 20 minutes Task1 What is the passive voive?（5）T：Show eg.and ask Ss to compare and find the difference（对比句子发现不同）1.We study English. 2. English

3、 is studied by us.T：The first sentence is the active voice,the second sentence is the passive voice.Look at the two sentences again, we can find: A. 主动语态表示主语是动作的执行者。 B. 被动语态表示主语是动作的承受者。 主动语态表示主语是动作的执行者。而被动语态是动词的一种特殊形式，表示句子中的主语是动作的承受者，也就是动作的对象。一般说来，只有需要动作对象的及物动词才有被动语态。设计意图：通过举例引导学生总结出什么是被动语态！ 教师进一步细化

4、分说，强化理解。1）不知道或没有必要说明动作的执行者是谁。例如：Some new computers were stolen last night.一些新电脑在昨晚被盗了。（不知道电脑是谁偷的）This bridge was founded in 1981.这座桥竣工于1981年。（2）强调动作的承受者，而不强调动作的执行者。例如：The glass was broken by Mike.玻璃杯是迈克打破的。This book was written by him.这本书是他写的。Your homework must be finished on time.你们的家庭作业必须及时完成。设计意图

5、：学生总结跟读的过程中熟练掌握何为被动语态.Task2. 被动语态的构成形式（5） T：According to the second sentence, please sum up the structure of the passive voice . Ss will look at the sentence again,and T lead them to find the usage of passive voice. (1.We study English.2.English is studied by us.)引导学生总结：被动语态的构成形式：助动词be+及物动词的过去分词助动词b

6、e有人称、时态和数的变化，与连系动词 be完全一样。eg：主动： Li ping writes a story-book. 被动： A story-book is written by Li Ping.a.The desk is made of wood. b. The desks are made of wood.设计意图：学生通过对比发现被动语态的句子的时态的变化，为下一步做铺垫。Task3 被动语态的时态 （10） 用PPt.演示被动语态的句子构成引导学生观察总结运用。The passive voice in different tenses一被动语态的谓语是由助动词be+过去分词构成的

7、，被动语态句子的不同时态的变化主要表现在助动词be上。T. will show the sentences in different tenses on ppt.and make the Ss.to read them out,T. help the Ss.to sum up something and write them on the Bb.(on PPt.)在ppt.上演示，将主动语态变为被动语态，引导学生总结被动语态在一些时态中的构成，教师把总结出的内容写再黑板上。二.主动语态变被动语态的方法总结完被动语态的构成后和学生一起发现：（1）把主动语态的宾语变为被动语态的主语。（2）把谓语变

8、成被动结构（be过去分词） （根据被动语态句子里的主语的人称和数，以及原来主动语态句子中动词的时态来决定be的形式）。（3）把主动语态中的主语放在介词by之后作宾语，将主格改为宾格。例如：A.We study English. B. English is studied by us（4）含有情态动词的主动句变成被动句时，由“情态动词be过去分词”构成. We can repair this watch in two days. This watch can be repaired in two days.设计意图：在做完相应的句型练习后，总结出把主动语态变被动语态的方法，旨在培养学生观察-总结

9、-运用的能力。三.当动词带有复合宾语(有宾补), 并且宾补是省去“to”的动词不定式时，在被动语态中应加上“to”。难点提升，将复合宾语变成被动语态，不做重点要求。 eg. 主动 They make us do all the work. 被动句：We are made to do all the work by them. eg.主动 We often hear her sing songs. 被动句：She is often heard to sing songs by us. eg.主动 I saw him walk to school. 被动句：He was seen to walk

10、to school by me.（让学生读下列内容，注意双宾语变被动语态的事项，如果时间允许请个别学生尽量能给出一、两个双宾语的被动语态句子。） 这些动词真奇怪，主动句中to 离开，被动句中to回 来。（ let ，have ，make，feel，see ,watch, hear,notice)设计意图：通过讲解和举例操练让学生对双宾语变为被动语态的情况进一步熟悉。Step3:consolidation and practice 12 minutes在这个环节和学生一起做个小游戏，left or right缓解一下大脑（2）Make the Ss to fill in the blacks.学

11、生两人一组讨论后给出填空答案，教师和其他学生一起评判，给与鼓励，进行巩固练习。1.People use knives for cutting things.Knives _ _ for cutting things.2.The students clean the windows of their classroom twice a month.The windows of their classroom_ _ twice a month.3.I found the ticket on the floor._ _ _ _ on the floor.4.I told her to return

12、the book in time.She _ _ to return the book in time.5. His doctor made him have only two meals a day.He _ _ _ _ only two meals a day.6.Now people can use computers to help them.Now computers _ _ _ to help them.7. Did you plant many trees at this time last year?_ _ _ _ at this time last time?8.Must w

13、e finish our work today?_ our work_ _ today?9. The foreign friends gave us some wonderful stamps.1) _ _ _ some wonderful stamps.2) Some wonderful stamps _ _ _ _.10.The teacher asked Tom to turn on the computer.Tom _ _ to turn on the computer.11.In this factory women do most of the work. Most of the

14、work _ _ by women in this factory.注意短语动词中的介词或副词变成被动语态时不可遗漏。eg：主动：The baby-sitter took care of the baby. 被动：The baby was taken care of by the baby-sitter. 设计意图：根据前面讲的内容有针对性的进行练习巩固主动语态变被动语态，要求熟练掌握，从而用被动语态表达身边发生的事情，激发学生学习英语的兴趣，热爱生活。Step4:summary 8minutesT will tell the Ss:Today we have learned-让学生回忆加以总

15、结。1.被动语态的定义：语态(voice)是个语法范畴，它是一种动词形式，表示动词的主语与该动词所表示的动作之间的主动和被动关系。当主语是动作的执行者时，动词用主动语态（Active Voice）；如果主语是动作的承受者，动词便用被动语态（Passive Voice）。Eg.We cleaned the classroom yesterday.昨天我们打扫了教室。The classroom was cleaned by us yesterday. 昨天教室被我们打扫了。2.被动语态在一些时态中的构成以及物动词do为例一般现在时： S+am/is /are +done一般过去时： S+was/were +done 一般将来时： S+willshall /be going to+bedone情态动词： S+ can/may/must/should + be+ done3.主动语态变被动语态的方法 （1）把主动语态的宾语变为被动语态的主语。（2）把谓语变成被动结构（be过去分词） （根据被动语态句子里的主语的人称和数，以及原来主动语态句子中动词的时态来决定be的形式）。（3）把主动语态中的主语放在介词by之后作宾语，将主格改为宾格。例如：A.We study English. B. English is studied by us设计意图：引导学生总结今天所学内容，加强记忆，巩固所学