Unit 13 Section A 4a-4c 课件 2025-2026学年人教版（2012）九年级英语全册

Unit13 We’re trying to save the earth. Section A 4a-4c 1.语言能力：在语境中理解、识记并运用本课时词汇：take part in,afford,turn off,reusable,pay for,take action,transportation 等；            2.文化意识：提高环境污染和环境保护的意识，保护环境，从小做起，从我做起； 3.思维品质：归纳总结初中阶段学过的重点时态，语态和句型，提高思维的逻辑性； 4.学习能力：能正确区分和使用以下语法结构：现在进行时、used to、被动语态、现在完成时、情态动词。 Objectives 1 Review PART 01 Review 听说 一碗 切掉 不仅......而且....... 对....有害 不再 在....顶端 给...带来危险 事实上 ...的数量 hear of=hear about a bowl of cut off not only... but also... be harmful to no longer bring danger to in fact the number of+n.复数(谓语单数) at the top of Review 在过去的20到30年 环境保护 比如 完善法律 .....的销售 到目前为止 7.下降了 8.下降到 in the last 20 to 30 years environmental protection such as+n./pron./v-ing develop laws so far fall by fall to the sale of 复习阅读课所学重点短语和语法，巩固所学知识。 2 Grammar focus PART 02 Grammar focus We’re trying to save the earth. Present progressive The river used to be so clean. used to The air is badly polluted. Passive voice No scientific studies have shown that shark fins are good for health. Present perfect We should help save the sharks. Modal verbs Present progressive 现在进行时的结构和用法 定义：表示说话时(瞬间)正在进行的动作, 也表示目前或现阶段 正在进行的动作，或说话者的强烈情感。 They are playing basketball now. Tom is working on a new book . Why are you always coming late for class? (正在进行) (目前正在进行) (说话者的强烈情感) 构成：be(am\is\are) ＋v-ing (动词的现在分词) Present progressive 现在进行时的结构和用法 标志：now, right now, look, listen,at the moment/time, these days, at present(当前) Look! The boy is crying. He is watching a movie now. I am studying English at present. Present progressive 特殊用法 一些表示位置移动的动词，如 go, come, leave, arrive等，常用现在 进行时结构表示将来，表示动作即将发生。 eg: Jack is leaving for Shanghai tomorrow. 明天杰克将前往上海。 eg: The bus is coming soon. 公车马上就要到了。 总结归纳现在进行时的定义，结构，时间状语标志以及特殊用法。 used to The river used to be so clean. Did the river use to be so clean ? The river didn’t use to be so clean. Yes,it did./ No, it didn’t. used to do sth. didn’t use to do sth. Did ...use to do sth. ? Yes,...did. No,...didn’t. used to相似句型 意为“被用来做某事”，后接动词原形。 be/get used to used to be used to do 意为“过去常常做某事”(而现在不做了)。后接动词原形。 意为“习惯于(做)某事”。后接名词，代词，动词-ing形式。 Practice 1.You used _________ (go) to school by bike，didn't you? 2. 我习惯于晚饭后打篮球。 I ____ ____ ____ _____basketball after dinner. 3.这种小刀是用来切东西的。 This kind of knife ____ ____ ____ ____ things. 4.He used to spend much time playing computer games.（改一般疑问句） ____ ____ ____ ____ ____ much time playing computer games? to go am used to playing is used to cut Did he use to spend 总结归纳used to的各种句式和相似句型和辨析。 Passive voice 定义：被动语态表示主语是动作的承受者，即行为动作的对象。 I cleaned my room. → My room was cleaned by me. I saw him cross the road. → He was seen to cross the road. 构成：be+过去分词 在含有使役动词 (如：make) 或感官动词 (see、watch、hear等) 的主动语态的句子中，这些词后常跟省略to的动词不定式，但是改为被动语态时则要把省去的to还原。 一般现在时的被动语态：am/is/are + 过去分词 一般过去时的被动语态：was/were + 过去分词 一般将来时的被动语态：will be/is going to be + 过去分词 1 2 3 现在完成时的被动语态：have/has been十过去分词 4 Passive voice 含情态动词的被动语态：情态动词 + be + 过去分词 5 Practice 1. The Secondary School Entrance Exam _______ (hold) in June. 2. A strange noise __________ (hear) by his mother last night. 3. A wide road _____________ (build) between the two villages by those people next year. 4.Actions should______________(take) to protect the earth. 5.The cookie has ______________(sell out)so far. is held was heard will be built be taken been sold out 总结归纳被动语态的定义，结构和初中阶段需要掌握的多种时态的被动语态结构。 Present perfect tense 现在完成时 定义 结构 标志 ①表示过去发生的动作对现在造成的影响； ②动作从过去某个时间开始，一直延续到现在，并可能继续延续下去。 have/has +动词的过去分词 already,yet, so far,before ,ever, never， just,in the past/last 5 years,for,since Practice 1.I _______________my homework yet. 我还没有完成作业。 2.I ________already _________reading the book. 我已经读完这本书了。 3.Linda___________(live) here since she was five years old. 琳达自从五岁起就住在这里。 4.In the past few years, great changes ______________(take place)in this city. 这座城市在过去的几年里发生了巨大的变化。 haven’t finished have finished has lived have taken place Present perfect tense 在现在完成时中，come, go, arrive, leave, buy 等非延续性动词不能与表示一段时间的时间状语(for;since)连用。若与表示一段时间的时间状语连用，非延续性动词要转换成相应的延续性动词或短语。常见的词如下: buy → have  borrow → keep join → be a member of finish → be over die → be dead  leave → be away begin → be on   fall asleep → be asleep open → be open marry-be married Practice 1.His father died 10 years ago.(改成现在完成时) His father_________________for 10 years. 2.The movie began 10 minutes ago.(改成现在完成时) The movie_______________since 10 minutes ago. 3.They married 3 years ago.(改成现在完成时) They__________________ since 3 years ago. has been dead have been married has been on 总结归纳现在完成时态的定义，结构，时间标志词和特殊情况。 modal verbs 表示说话人对所述动作或状态的态度或看法。情态动词无人称和数的变化，不能单独使用，其后接动词原形，构成谓语。否定形式的构成是在情态动词后面加not。 常见的情态动词有 can (could), may (might), must, have to,need, should, will (would)等。 modal verbs：can/could 情态动词 意义及用法 意为“能；会”，表示能力，此时could 为can的过去式。 意为“可以”，表示请求、许可，此时could不是can的过去式，而是表示更委婉、客气的语气。 意为“可能”，can表示推测，常用于否定句或疑问句中。can’t表示不可能。 can/could eg:She could play the guitar at the age of four.Now she can play very well. eg:Could you please take out the rubbish？ Sure,I can. eg:Can the news be true? No,it can’t be true. modal verbs：may/might / must/have to may/might 意为“可以”，用于肯定句中表示许可；用于疑问句中表示请求。might比may更委婉。 意为“可能；也许”，表示推测，常用于肯定句中。 eg:May/Might I smoke here? eg:He may/might be in the classroom,because I saw him there just now. must和 have to意为“必须”，表示义务或责任。must表示强调主观看法。have to “不得不，必须”，强调客观情况。 must意为“一定；肯定”，表示推测，只能用于肯定句中。 eg:I must study hard. eg:I have to look after my sister at home,because my mom is busy. eg:This book must belong to Linda. eg:You may/might come earlier. modal verbs：should/need/would should意为“应该”，表示劝告、建议、命令等。 eg:You should read the textbook aloud to practice your spoken English. need意为“需要；必要”，多用于否定句或疑问句中。以must开头的一般疑问句的否定回答常用needn’t或doesn’t/don ’t have to。 eg:Must I hand in the homework right now? No,you don’t have to/needn’t. would意为“愿意；将要”，表示意愿、请求等。 eg:He said that he would go to Shanghai for business. 总结归纳情态动词的基本性质和常见情态动词的用法并进行辨析。 3 Exercises PART 03 4a Fill in the blanks with the correct forms of the verbs in brackets. Joe: ______ you ever ________ (take) part in an environmental project? Ken: Yes, I have. I _______ (help) with a Clean-Up Day last year. It was __________ (consider) the biggest clean-up project this city______ ever ________ (have). Joe: How many people ________ (take) part? Have taken helped considered had had took take part in+活动(大型群体型活动) 参加 Ken: I ___________ (think) more than 1,000 people ______(come) to help out. Joe: That’s fantastic! I guess everyone in this city is ______ (try) to improve the environment. Ken: Yes, we can’t afford to________ (wait) any longer to take action! think came trying wait 采取行动 afford 1. Yes, we can’t afford to wait any longer to take action! afford /əˈfɔː(r)d / v. 承担得起（后果）；买得起 afford作动词，常用在can、could、be able to等之后。afford sth.“买得起某物”；afford to do sth.“负担得起做某事”。 I can’t afford the new TV. I hope I can afford to buy a big house one day. 4b Fill in the blanks with the appropriate modal verbs from the box. People _________ think that big things__________________ be done to save the earth. Many forget that saving the earth begins with small things. For example, you ______________ save electricity by turning off the lights when you leave a room. You _______________ also use reusable bags instead of plastic bags. can would could have to should must may/ might may/might should/have to/must can/could/should can/could/should adj. 可重复使用的；可再次使用的 I think it’s a great idea that you now _______ pay for plastic bags in some stores. And instead of driving to school or work, you _______________ ride your bike or walk. If it’s far, you __________ take the bus. All these small things ______ add up and become big things that __________ improve the environment. Let’s take action now! have to can/could/should can can/could can/would 4c Make a list of things that people can do to help the environment and discuss your list with your partner. I think that everyone should use public transportation. I disagree. It’s difficult for parents with young children to use public transportation... use public transportation n. 运输业；交通运输 $