Unit 5 Power of Ideas Section A 4a-4c 课件 2026-2027学年人教版英语九年级上册

Unit 5 Power of Ideas Grammar Focus 观察 4a 例句，准确识别被动语态谓语动词，总结一般现在、一般过去时被动语态完整结构。（学习理解） 01 读懂 4c 青藏铁路短文，结合语境完成语篇填空，熟练在篇章中运用被动语态，感受我国基建成就。（迁移创新） 03 独立完成 4b 单句填空，根据时间标志词正确变换 be 动词与动词过去分词，掌握被动语态解题步骤。（应用实践） 02 教学目标 4a Read the sentences. Circle the verbs in the passive voice. 什么是被动语态？ 被动语态概述 被动语态的构成： 主语+be (am / is / are/was/were) +及物动词的_______分词  过去 动词过去分词的变化规则： 1.一般情况加-ed. look--looked play--played 2.以e结尾的动词，只加-d. live--lived hope--hoped 3.以重读闭音节结尾的动词，末尾只有一个辅音, 应双写这个辅音字母，再加-ed. stop--stopped plan--planned 4.以辅音字母加y 结尾的动词，变y为i,再加-ed. study--studied carry--carried 5.不规则变化（见课本127-130页的不规则动词表） 被动语态结构： 1、一般现在时的被动语态： am/is/are + 动词的过去分词 即：am/is/are + done e.g. The shirts are made of silk. Our classroom is cleaned by us every day. 2、一般过去时的被动语态： was/were + 动词的过去分词 即：was/were + done e.g. The trees were planted by these students. The chicken was killed by that man. 3、情态动词的被动语态： 情态动词 + be + 动词的过去分词 即：情态动词 + be + done e.g. The work will be finished in ten days. e.g.Tables can be made of stone. The lights must be turned off by you. 4.一般将来时被动语态： will/shall+ be + 动词的过去分词 被动语态的句式结构 肯定式：主语＋ be＋过去分词(＋by…) 否定式：主语+be + not 过去分词（by…） 一般疑问句： Be +主语+过去分词（by…）? 特殊疑问句：疑问词+be +主语+过去分词+（by…）? 被动语态的用法 1）不知道动作的执行者是谁 2）没有必要指出动作的执行者 3) 需要强调或突出动作的承受者 My bike was stolen yesterday. More trees must be planted every year. Chinese is spoken by more and more people in the world. 不用被动语态的情况 1）像happen, take place,等不及物动词没有被动语态。 e.g. A traffic accident happened just now. 2）连系动词look, sound, taste, smell，feel 等不用被动语态。 e.g. Mooncakes taste delicious. The idea sounds great. 3）.感官动词和使役动词的被动语态 即：三眼：see watch look at(notice) 两耳：hear listen to 一感觉：feel 三使役：make have let e.g. 1.I saw him play basketball last Sunday. --- 2.The boss makes him work for 10 hours. --- He was seen to play basketball last Sunday. He is made to work for 10 hours. 这些词在主动句中，其后的动词不加to，但变被动句时必须加to. 主动语态如何变被动语态: We speak English (主动语态) 主语 谓语 宾语 English is spoken by us (被动语态) by:被...由... 主语 谓语 宾语 宾变主,主变介宾 谓变be done时不变（be体现时态，人称和数的变化） 句型转换（把主动句改为被动句） 1. People plant trees every year. __________________________________________________________________ 2. We clean our classroom every day. ________________________________________________________________ 3. He invented the radio in the 1890s. ______________________________________________________________________ 4.We must protect the environment. ______________________________________________________________________ 5. Many people speak English. ______________________________________________________________________ 6. They built this hospital last year. _______________________________________________________________________ 7. Students must finish homework on time. _______________________________________________________________________  Trees are planted by people every year. Our classroom is cleaned by us every day. The radio was invented by him in the 1890s. The environment must be protected by us. English is spoken by many people. This hospital was built by them last year.  Homework must be finished by students on time. (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. (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. was invented are connected was introduced was pressed was found Complete the sentences with the correct forms of the verbs in brackets. 4b Which railway is the picture showing? The Qinghai-Xizang Railway • How much do you know about this railway? Complete the passage with the correct forms of the verbs in brackets. 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. 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 are animal-friendly and ________ (allow) animals to pass under the tracks. connects were needed were used be created were built allow 4c Complete the passage with the correct forms of the verbs in brackets. 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. increased (to) improve 4c Answer the following questions. 1. When was the Qinghai–Xizang Railway completed?  _____________________________________________________________ 2. Why were pipes used when building the railway?  _____________________________________________________________ 3. What can animals do under the animal-friendly bridges?  ____________________________________________________________ 4. What had to be created in some places over the frozen ground? ______________________________________________________________ It was completed in 2006. Because pipes were used to keep the ground hard. They can pass under the tracks. Tunnels had to be created instead. Language points all over the world 全世界 与around the world同义，在句中作状语。all over意为“遍布”。 all over的相关短语： all over China 全中国 all over the country 全国 all over the place 到处 Language points be supposed to do/be sth. 应当做（某事）或是（某物） 表示按规定、习惯、安排等应该做某事或应该是某物，其否定形式为be not supposed to do sth. “不应当做（某事）或是（某物）”。 表示按规定、习惯、安排等应该做某事或应该是某物，其否定形式为be not supposed to do sth. “不应当做（某事）或是（某物）”。 Language points such a/an+adj.+可数名词单数 如此……的…… 此处such作限定词，表示“如此程度”。“such a/an+adj.+可数名词单数”表示“如此……的……”，可与“so+adj.+a/an+可数名词单数”互换。 such也可修饰可数名词复数或不可数名词，结构为“such+adj.+可数名词复数/不可数名词”。 定义：被动语态中，句子主语是动作的承受者，描述“某物/某人被……”。 一般现在时被动：am /is/are + done 一般过去时被动：was /were + done 含情态动词的被动：情态动词 + be + 过去分词 解题三步：①判主被动 ②找时间定时态 ③变过去分词 Summary Exercise 一、用所给动词的适当形式填空 1. This kind of bike ____________________ (make) in China. 2. The bridge ______________________ (build) in 2000. 3. The rules _______________ (must follow) by all students. 4. Many beautiful flowers _____________ (see) in the park every spring. 5. A lot of letters _____________ (send) yesterday morning. 二、句型转换（主动变被动) 1. People grow rice in the south.（改为被动语态） Rice ______ ______ in the south. 2. They built the house in 2010.（改为被动语态） The house ______ ______ in 2010. 3. We must clean our classroom every day.（改为被动语态） Our classroom ______ ______ ______ every day. 4. He invented the radio in the 1890s.（改为被动语态） The radio ______ ______ in the 1890s. $