Unit 5Power of Ideas第4课时（Section A 4a-4c）课件2026-2027学年人教版九年级英语上册

该初中英语课件聚焦一般现在时、一般过去时及含情态动词的被动语态，通过动词过去分词对照表复习基础，对比主动与被动语态句子，搭建从已知到新知的学习支架，帮助学生理解被动语态的构成与用法。 其亮点在于语法教学与语篇应用结合，如4c以青藏铁路为语篇载体，既巩固被动语态又渗透家国情怀，培养文化意识。通过“三步法”转化主动与被动语态，结合基础练习与语篇填空，提升语言能力和思维品质。学生能在真实语境中运用语法，教师可依托系统资源高效教学。

nullUnit 5 Power of Ideas 第4课时 (Section A 4a-4c) R·九年级上册 Review 动词原形 过去分词 bring build buy catch choose cost cut 动词原形 过去分词 do draw dream drink drive eat fall Fill in the past participles in the chart brought built bought caught chosen cost cut done drawn dreamt/dreamed drunk driven eaten fallen 动词原形 过去分词 find forget give go grow have hear 动词原形 过去分词 hide hurt keep know leave light make found forgotten given gone grown had heard hidden hurt kept known left lit/lighted made 动词原形 过去分词 pay put read say see send set 动词原形 过去分词 show take teach tell think wear write paid put read said seen sent set shown taken taught told thought worn written I ate an apple. 两个句子描述的是同一件事， 区别是什么？ （主动语态，强调动作执行者） （被动语态，强调动作承受者） Read& compare An apple was eaten me. by 被字句 Read the sentences. Circle the verbs in the passive voice. A mini-camera is connected to the front of the glasses. The oil and salt are also added by the machine itself. Toys, chairs, tables, and even houses can all be made by the 3D printer. A radio message was sent across the Atlantic Ocean for the first time in 1901. 思考：观察be动词的时态变化，前三个句子和后面一个句子被动语态形式有什么区别？ 4a 被动语态 一般现在时的被动语态 一般现在时的被动语态 含情态动词的被动语态 一般过去时的被动语态 Grammar Focus 英语中有两种语态，即主动语态（the active voice）和被动语态（the passive voice）。主动语态表示主语是谓语动作的执行者。被动语态表示主语是谓语动作的承受者。 一般现在时和一般过去时的被动语态 1.被动语态的含义 主动语态：Jack tells a story. 被动语态：A story is told by Jack. 动作的执行者 动作的承受者 被动语态由“be 动词（am/is/are/was/were）+及物动词的过去分词”构成。be动词随主语的 人称和数及时态的变化而变化。 2.被动语态的构成 注：只有及物动词(vt)才有被动语态。 例如：I run/ cry 没被动语态。 (1)不知道或没必要说明动作的执行者时。 ◆These books are written for children. 这些书是为儿童写的。 (2)强调动作的承受者时，可以用 by 引出。 ◆Basketball was invented by James Naismith. 篮球运动是由詹姆斯·奈史密斯发明的。 3.被动语态的用法 (3)出于礼貌等方面的考虑不愿说出动作的 执行者是谁。 ◆ He was invited to attend a lecture on how to improve the memory. 他被邀请去参加一个如何提高记忆力 的讲座。 句式 结构 例句 肯定句 否定句 主语+be动词（am/is/are/was/were）+及物动词的过去分词（+其他）. 4.基本句式结构 主语+be动词（am/is/are/was/ were）+not+及物动词的过去 分词（+其他）. The kite is/was made by my father. 这个风筝是我爸爸做的。 The kite isn’t/wasn’t made by my father. 这个风筝不是我爸爸做的。 句式 结构 例句 一般疑问句 特殊疑问句 Be动词（Am/Is/Are/Was/Were）+主语+及物动词的过去分词（+其他）? 肯定回答：Yes,主语+be动词. 否定回答：No,主语+be动词+not. 疑问词（组）+be动词（am/is/are /was/were）（+主语）+及物动词 的过去分词（+其他）？ —Is/Was the kite made by your father? 这个风筝是你爸爸做的吗？ —Yes, it is/was. 是的，它是。/ —No, it isn’t/wasn’t. 不，它不是。 What is/was made by your father? 什么是你爸爸做的？ 5.主动语态变被动语态的方法 ①将主动语态中的宾语变为被动语态中的主语。 ②将主动语态中的谓语变为“be动词+及物动词 的过去分词” ③将主动语态中的主语置于by后，作by的宾语， 有时也可省略。 “三步法” 练习：Many people read this novel.（变被动语态） ——————————————————— This novel is read by many people. 6.被动语态的特殊情况。 带“双宾 语”的被动 如果主动句中有两个宾语（直接宾语和间接宾语），可以将其中任何一个宾语变成被动句的主语。 My teacher gave me some advice. I was given some advice by my teacher. Some advice was given to me by my teacher. ◆我的老师给了我一些建议。 1. The telephone ____________ (invent) by Alexander Bell in 1876. 2. People all over the world _____________ (connect) to each other through the internet. 3. The word “robot” ______________ (introduce)for the first time in a play in 1920. Complete the sentences with the correct forms of the verbs in brackets. 4b /ˈtelɪfəʊn/（名词）电话 /ˌælɪɡˈzændər / was invented are connected was introduced 基础巩固 4. It wasn’t supposed to make such a loud noise when the button ___________ (press)to start the machine. 5. It is believed that the world’s oldest wheel _________ (find)in Eastern Europe. /səˈpəʊz/ 认为；推断 be supposed to do/be sth 应当做（某事）或是（某物） was pressed /wiːl/（名词）车轮；轮子 /ˈiːstən/（形容词） 东部的；向东的 /ˈjʊərəp/ 欧洲 was found The Qinghai-Xizang Railway was completed in 2006. It __________(connect) Xining to Lhasa, a huge distance of 1,956 kilometres, and it is the highest railway in the world, reaching 5,072 metres above sea level at Tanggula Pass. The building of the railway was a great challenge. Complete the passage with the correct forms of the verbs in brackets. Make a profile of the Qinghai-Xizang Railway. 4c connect... to... 把……和……连接起来；连接……到…… connects a distance of... ……的距离 海拔高度 关口；关隘 语篇应用 Creative ideas ___________(need) to solve different problems. In summer, the top layer of the frozen ground would melt and become too soft to build on, so pipes __________(use) to keep the ground hard. However, in some places, it was impossible to build the railway over the frozen ground, so tunnels had to ___________(create) instead. In some other places, bridges __________(build) to keep the railway up above the ground. These bridges /ˈfrəʊzn/冻硬的；冰封的 were needed /melt/ 融化；逐渐消失 were used keep+宾语+宾语补足语 使……保持某种状态 tunnel/ˈtʌnl/（名词）隧道；地下通道 railway tunnel 铁路隧道 be created were built /paɪp/管道；管子 are animal-friendly and _______ (allow) animals to pass under the tracks. As an important and successful project, the railway has ___________ (increase) tourism and economic development in the area. The lessons learnt and experience gained from building this railway will help ___________(improve) transport in other similar places in the world. learnt和gained是过去分词作后置定语，分别修饰lessons与experience。 allow 轨道 /ˈtʊərɪzəm/旅游业 /ˌiːkəˈnɒmɪk/ 经济的；经济学的 increased to improve /geɪn/获得；取得 Profile of the Qinghai-Xizang Railway Finish time Total length Function Challenges and solutions Contribution (贡献) in 2006 1,956 kilometres It connects Xining to Lhasa. Pipes were placed to keep the ground hard in summer when the top layer of frozen ground melted and became too soft. Tunnels were created instead of building the railway over the frozen ground. Bridges were built to keep the railway up above the ground. It has increased tourism and economic development in the area. It will help to improve transport in other similar places in the world. language points suppose /səˈpəʊz/ 〔动词〕 1. It wasn’t supposed to make such a loud noise when the button was pressed to start the machine. 认为；推断 suppose sb/sth（to be）... 认为/推断某人/某物（是……） suppose（that）... 认为/推断…… We suppose his method to be effective. 我们认为他的方法很有效。 I suppose（that）she recognized you. 我推断她认出了你。 (2)假定；假设 suppose（that）... 假设…… Suppose（that）flights are fully booked on that day, what should we do? 假设那天的航班都订满了，我们应该怎么办？ be supposed to do/be sth 应当做（某事）或是（某物） 表示按规定、习惯、安排等应当做某事或是某物。 否定形式为“be not supposed to do/be sth”。 As teenagers, we are supposed to put our brains to good use. 作为青少年，我们应该有效用脑。 Everyone is not supposed to be late when taking an exam. 考试时大家都不应该迟到。 frozen /ˈfrəʊzn/ 〔形容词〕 2. In summer, the top layer of the frozen ground would melt and become too soft to build on, so pipes were used to keep the ground hard. (1)冻硬的；冰封的 The frozen river is melting faster than we expected. 这条结冰的河流融化得比我们预想的要快。 (2) 冻僵；极冷 You must be frozen! Come and sit by the fire. 你肯定冻僵了！坐到炉火边上来。 (3) 冷冻的；冷藏的 If you go to Harbin, you can try frozen pears. 如果你去哈尔滨，可以尝尝冻梨。 拓展：frozen 的相关词 freeze v. （使）冻结；结冰 frozen adj. 冻硬的；冰封的 freezing adj. 极冷的；冰冻的 melt /melt/ 〔动词〕 (1) （使）融化；逐渐消失 The snow showed no sign of melting. 雪没有一点融化的迹象。 (2) （使）软化，变得温柔 Her trusting smile melted his heart. 她那信任的微笑使他的心变软了。 pipe /paɪp/ (1) 〔名词〕管道；管子 He hit a water pipe and the flat was filled with water. 他撞到了一根水管，公寓被水灌满了。 (2) 〔名词〕烟斗 Dad was smoking his pipe when I entered the room. 我进房间时，爸爸正吸着烟斗。 (3) 〔动词〕用管道输送 We need to pipe water across the sandy areas to grow more trees. 我们需要把水通过管道输送到沙区，以便种植更多树木。 tourism /ˈtʊərɪzəm/ 〔不可数名词〕 旅游业 3. As an important and successful project, the railway has increased tourism and economic development in the area. Red tourism has developed quickly and it’s becoming more and more popular. 红色旅游发展迅速，并且正变得越来越受欢迎。 拓展：tourism 的相关词 tour n. & v. 旅行；旅游 tourism n. 旅游业 tourist n. 旅行者；观光客 串记：With the development of tourism, our village has become a tourist attraction. Thousands of people tour our village every year. 随着旅游业的发展，我们村已经成了一个旅游景点。每年都有成千上万的人来我们村游览。 economic /ˌiːkəˈnɒmɪk/ 〔形容词〕 经济的；经济学的 economic growth/development 经济增长/发展 The rapid economic growth in this city has attracted many young people to work here. 这座城市快速的经济增长吸引了许多年轻人前来工作。 拓展：economy〔名词〕经济 gain /geɪn/ 4. The lessons learnt and experience gained from building this railway will help to improve transport in other similar places in the world. (1) 〔动词〕获得；取得 Students can gain valuable experience by working on the school magazine. 学生们通过在校刊工作能够获得宝贵的经验。 (2) 〔动词〕增加；增添；增长 搭配：gain confidence/strength/experience 增加信心/力量/经验 With the government’s support, many young people begin to gain confidence. 在政府的支持下，许多年轻人开始增加信心。 (3) 〔名词〕好处；利益；改进 These decisions have resulted in great gains in public health. 这些决定使公共卫生得到极大改进。 Review the grammar of passive voice with simple present and past tenses. Review the language points in this lesson. Do some related exercises. Homework $