Unit 5 Section Ⅲ Discovering Useful Structures-(配套课件)【精讲精练】2025-2026学年高中英语必修第三册(人教版)

该高中英语课件围绕Unit 5 The Value of Money的情态动词和过去将来时，通过“语法精讲+技能培养”等栏目，从基本特征、表意功能到推测用法、have done结构，结合即时训练搭建学习支架，帮助学生逐步掌握语法知识脉络。 其亮点在于体系化拆解语法点，如情态动词分can/could等7类详解，“名师点津”辨析易混点（如can与be able to），结合语言能力（例句中英对照）和思维品质（逻辑辨析），随堂演练与课时作业分层巩固，学生能提升语法运用能力，教师可直接用于教学提高效率。

Section Ⅲ　Discovering Useful Structures Unit 5　The Value of Money 栏目导航 Unit 5　The Value of Money 1 栏目导航 语法精讲•技能培养 01 核心知识•关键能力 02 随堂演练•巩固提升 03 课时作业•知能达标 04 栏目导航 Unit 5　The Value of Money 1 语法精讲•技能培养 栏目导航 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 Could must can must can 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 may/might Shall May should 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 would will dared need 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 can must can may 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 should have passed may have bought the dictionary 栏目导航 Unit 5　The Value of Money 1 might have never heard of needn't have booked the ticket 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 was leaving would lend was to become was going to visit would be 栏目导航 Unit 5　The Value of Money 1 核心知识•关键能力 栏目导航 栏目导航 Unit 5　The Value of Money 1     栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 intention to go which is intended for international students 栏目导航 Unit 5　The Value of Money 1     栏目导航 Unit 5　The Value of Money 1 栏目导航 Unit 5　The Value of Money 1 As is often the case In case In no case can we 栏目导航 Unit 5　The Value of Money 1 随堂演练•巩固提升 栏目导航 栏目导航 Unit 5　The Value of Money 1 must have come from 栏目导航 Unit 5　The Value of Money 1 may/might have left should have finished 栏目导航 Unit 5　The Value of Money 1 was going to hold a class meeting were to be 栏目导航 Unit 5　The Value of Money 1 课时作业•知能达标 栏目导航 栏目导航 Unit 5　The Value of Money 1 谢谢观看 栏目导航 Unit 5　The Value of Money 1 情态动词和过去将来时 一、情态动词 情态动词本身有一定的词义，通常与动词原形一起构成谓语，表示说话人对某一动作或状态的态度或主观设想。 1．基本特征 (1)在意义上，情态动词有一定的词义，但不能单独作谓语，需和实义动词或系动词一起作谓语。 (2)在形式上，情态动词一般没有人称和数的变化(be able to，have to 除外)。 (3)在用法上，情态动词与助动词一样，其后需接动词原形，构成谓语动词。 2．情态动词的主要表意功能 (1)can/could 的用法 ①表示能力，意为“能，会”；could主要指过去的能力。 Everyone can play a part in protecting the environment. 每个人都可以在保护环境方面发挥作用。 You can use the following writing exercise to help you do this. 你可以使用下面的写作练习来帮助你做到这一点。 ②表示请求或许可。 当请求允许做某事时，两者均可用，但could语气更委婉。当表示允许某人做某事时，一般要用can，而不用could。 —Can/Could I use your bike tomorrow morning? —Yes，you can. ——我明天早晨能用你的自行车吗？ ——是的，可以。 ③表示惊异、怀疑、不相信等态度时，意为“怎么能，怎么会”，主要用于否定句、疑问句或感叹句中，用could时语气较委婉。 How can you stay so calm after such a hot argument? 在如此激烈的争论之后，你怎么还能保持如此冷静？ can与be able to的区别 (1)can只能用在一般现在时，而be able to可用于更多的时态。 (2)表示过去特定的能力或经过努力才具备的能力，只能用be able to。 (2)must 的用法 表示现在或将来必须要做某事，多是出于义务、责任或强制命令，指说话人的主观意志。 We must promote our environmental awareness and behave ourselves. 我们必须提高环保意识，并规范我们的行为。 She teaches that people must take responsibility for saving their environment. 她教育人们必须承担拯救环境的责任。 (1)回答must引出的问句时，如果是否定的回答，则不能用mustn't，而要用needn't或don't have to。 (2)must用于疑问句中，可以用来表示责备、抱怨的感情色彩，意为“偏要，硬要”。mustn't的意思是“禁止”，而不是“不必”。 [即时训练1]　用适当的情态动词填空 ①_____ you please be kind enough to tell me something about that? ②Life is full of choices，so we ____ think clearly before making a decision. ③I'm not a trained musician，but I've learnt to read music so I ___ help Maria in her performance. ④Tom，you ____ not leave all your clothes on the floor like this! ⑤I sincerely hope you ___ accept my invitation. (3)may/might 的用法 ①表示请求时，两者都可用，只是might表示的语气较委婉(但并不表示过去)；表示许可时，通常要用may而不用might。 If it is convenient，may/might I pay you a visit at your office next Tuesday? 如果方便的话，我可以下周二到办公室拜访你吗？ ②may表示祝福与愿望，多用于书面语中，构成“may＋you/名词＋动词原形＋...”句型。 May you have a good journey! 祝你旅途愉快！ “may well＋动词原形”表示“很可能”；may/might as well do sth表示“不妨做某事”。 (4)shall 的用法 ①shall用于第一、三人称的疑问句中时，表示征求意见。 —Shall I order a taxi for Sarah to go to the airport tonight? —Don't bother.I'll drive her there. ——我要给莎拉订今天晚上去机场的出租车吗？ ——不用麻烦了。我会开车送她去的。 ②用于第二、三人称的陈述句时，往往表示给对方(you)或第三者(he，she，they)以允诺、命令、决心、警告或威胁等，在法律、条约、协定等文件中可以表示义务、规定等。 You shall fail if you don't work harder. 如果你不再努力点儿，你就会失败。(警告) Each citizen shall carry his ID card when travelling. 旅游时每个市民务必带上身份证。(规定) (5)should/ought to 的用法 ①ought to和should意为“应该”，ought to表示义务或责任，比should语气重。 I should help her because she is in trouble. 她遇到麻烦了，我应该帮助她。 ②表示劝告、建议和命令。should，ought to可通用，但在疑问句中常用should。 You should/ought to go to class right away in case you are late. 你应该立刻去上课，以免迟到。 ③should表示惊讶、赞叹或不满，意为“竟然”。 It's strange that he should speak to his mother in such a rude manner. 真奇怪，他竟然用这样粗鲁的态度跟他的母亲说话。 [即时训练2]　用适当的情态动词填空 ①You _________ as well walk outside with your friends or take some exercise. ②_____ we go there together this Friday afternoon? ③_____ you have a pleasant journey home and welcome to China again. ④I have realised that I ______ be responsible for not only myself，but also for the society. (6)will/would 的用法 ①will表示“意愿，意志”，would表示过去时间的“意愿，意志”。 I promise I will do my best to provide best service for the City Games. 我许诺我会尽最大努力为城市运动会提供最好的服务。 I told her to stop crying，but she just wouldn't listen. 我告诉她别哭，但是她不愿意听。 ②表示征求意见或提出请求，主要用于第二人称的疑问句中，will和would均可用，would此时不表示过去，而是表示委婉语气。 If I send back the wrong shoes，will your company pay for the postage? 如果我把有问题的鞋发回去，你们公司可以付邮费吗？ ③will表示某种倾向或习惯性动作，意为“总会，老是”；would表示过去反复发生的动作或过去的一种倾向。 Fish will die without water. 没有水，鱼会死去。 During the vacation，he would visit me every other day. 在假期中，他每隔一天来看我一次。 would与used to的区别 (1)would表示过去经常性且反复发生的动作，没有与现在对比的含义。 (2)used to表示过去经常发生的动作或存在的状态，且现在已终止，强调今昔对比。 (7)need/dare 的用法 ①need表示必要性，意为“需要”，dare意为“敢于”；need和dare作情态动词时，常用于否定句、疑问句或条件句中，无人称和数的变化，疑问句和否定句中不加助动词。 You needn't come here this afternoon. 你今天下午不必来这里。 How dare you say I'm unfair? 你怎么敢说我不公平？ ②need和dare用作实义动词时，有词形变化。在否定句、疑问句中要加助动词。 You don't need to hurry.You have enough time. 你不必着急。你有足够的时间。 He doesn't dare (to) answer.他不敢回答。 Do you need a dictionary?你需要一本词典吗？ How did you dare (to) tell her?你怎么敢告诉她？ [即时训练3]　用适当的情态动词填空 ①He _____ go to the river nearby to fish on weekends when he was young. ②—Sorry，I forgot to tell John about your party. —It doesn't matter.I ____ call him in a while. ③Many people were standing around watching with sympathy，but no one _____ to help him up. ④You ____ to get rid of the habit of drinking cola only. 3．情态动词表示推测 (1)must表示有把握的推测，只用于肯定句中，意为“一定，肯定”。 I think we must have taken a wrong turning somewhere. 我觉得我们一定是在什么地方拐错了路。 I'm sure that you must be concerned about Robert the moment you left for London. 我确信你一去伦敦就会很担心罗伯特。 (2)can/could表示推测，意为“可能”，用于否定句和疑问句中。can比could语气强。 He must be at home; he can't still be in the office at such a late hour. 他一定在家，他这么晚一定不会在办公室。 can表示客观可能性(理论上或是逻辑判断上)，意为“可能会”。 (3)may/might意为“可能，也许”，指可能性小的猜测。might比may语气更不确定，表示的可能性更小。 He may be at home，but I am not sure. 他或许在家，但是我不确定。 I tell my mom that if we're forced to eat things，we may become ill. 我告诉我妈妈，如果我们被迫吃东西，我们可能会生病。 (4)should表示推测，暗含很大的可能，意为“应该，理应”。 It's 4：30.They should be in New York by now. 现在是四点半，他们现在应该到达纽约了。 [即时训练4]　用适当的情态动词填空 ①It is usually warm in winter in the south，but it ___ be cold and even have snow sometimes. ②I am sure that you ____ be very interested in the activities at the party. ③Jack ___ not be in the reading room now.Because I saw him in the office just now. ④According to the weather report，it ___ rain tomorrow. 4．情态动词＋have done (1)must have done表示对过去的肯定推测，意为“过去肯定……”。 It must have rained last night，for the road was quite wet. 昨晚肯定下雨了，因为路面十分潮湿。 (2)can't/couldn't have done表示对过去的否定推测，意为“过去不可能做了……”。 He couldn't have known the decision，but someone told him. 他一定不知道这个决定，但是有人告诉他了。 (3)could have done意为“本来能够做而没做”。 You could have made greater progress，but you didn't try your best. 你本来能够取得更大的进步，但是你并没有尽全力。 (4)may/might (not) have done 意为“可能(没有)做过某事”。 You may have lost your wallet when you were shopping in the market. 你或许是在市场买东西的时候丢了钱包。 (5)should (not)/ought (not) to have done意为“本来该做而没做/本来不该做而做了”。 You should have come to school if you were really serious about your study. 要是你真的认真对待学习的话，你本应该来上学的。 (6)needn't have done意为“本来不必做却做了”。 You needn't have telephoned him，for he had known the result. 你本不必打电话给他，因为他已经知道了结果。 [即时训练5]　完成句子 ①It was an easy test and he __________________，but he didn't. 那个测试很容易，他本来应该通过的，但却没有。 ②She ______________________________，but I'm not sure. 她可能买了那本词典，但我不确定。 ③You _________________________ the Chongyang Festival，but it is actually my favourite. 你或许从没听说过重阳节，但实际上这是我最喜欢的节日。 ④You ______________________________，for the zoo is open to the public free of charge these days. 你本没必要订票的，因为这几天动物园免费向公众开放。 二、过去将来时 1．过去将来时的用法和基本结构 过去将来时表示从过去某一时间来看将要发生的动作或存在的状态，常用在宾语从句中。过去将来时的基本结构是“would＋动词原形”，否定式是在would后加not。 Then，I realised something terrible would happen. 那时，我意识到糟糕的事情将要发生。 My brother told me that he would come back on Saturday. 我哥哥告诉我他周六回来。 2．过去将来时的其他表示方法 (1)“was/were going to＋动词原形”表示过去将要发生或很有可能发生的动作，常用于口语中，表示预言、意图或打算等。 I was going to play basketball，but in the end I went to the cinema. 我打算去打篮球，但是最后我去看电影了。 He was going to start work the following week. 他打算下星期开始工作。 (2)was/were about to do意为“刚要/正要做……”，常用来表示过去即将发生的动作，不与任何时间状语连用。 When we were about to leave，the children waved their hands and thanked us for our kindness. 我们正要离开的时候，孩子们挥舞着双手，感谢我们的好意。 (3)start，go，come，leave，see，meet等动词可用过去进行时，表示就过去某一时刻而言即将发生的动作。 I had just put on my overcoat and was leaving to visit a friend of mine. 我刚穿上长大衣要去看我的一个朋友。 (4)was/were to do表示“曾计划做某事”；如果表示“本来计划做某事，但是没实现”，则用was/were to have done。 Last night，my classmates and I heatedly discussed the trip our class were to take at the weekend. 昨晚，我和同学们热烈地讨论了我们班计划在周末进行的旅行。 [即时训练6]　单句语法填空 ①She said the bus ___________ (leave) at five the next morning. ②I wasn't sure whether he __________ (lend) me his book the next morning. ③At that time he did not know that quitting the job _____________ (become) the turning point in his life. ④He said he __________________ (visit) China the next week. ⑤In his introduction，he made it clear that our credit ________ (be) hard­earned. intention n.打算；计划；意图；目的 (1)with the intention of　目的是…… have no intention of doing sth　无意做某事 (2)intend vt.　计划；打算 intend to do sth　打算/想要做某事 (3)be intended to do...　为了做…… be intended for...　专门为……而设计的 [经典佳句] 　This Sunday saw the thrilling and impressive competition held by our school with the intention of improving our reading ability. 本周日，我们学校举办了一场激动人心的和令人印象深刻的比赛，旨在提高我们的阅读能力。 [即时训练]　 单句语法填空/完成句子 ①The _________ (intend) of the activity is to make us aware of the importance of environmental protection. ②I intend _____ (go) with you as I have great interest in the lecture about cultural differences. ③The Chinese Summer Camp，_____________________________ _________，is going to be held in our school. 专门针对国际学生的中文夏令营将在我们学校举办。 in case 以防；以防万一 in case of　万一；如果发生…… in this/that case　在这种/那种情况下 in any case　无论如何 in no case　决不(置于句首时，引起部分倒装) as is often the case　这是常有的事 [经典佳句] 　Aware of the mission，I made up my mind to return and get the work done in case of my father's punishment. 意识到这一使命，我下定决心回来完成工作，以防受到父亲的惩罚。 [即时训练]　 用case的相关短语填空/完成句子 ① ____________________，old people are fond of talking about good old days. ② _______ it rains，the sports meeting will be postponed till the first fine day. ③_________________ go against the law of nature or we'll meet endless suffering. 我们决不能违背自然法则，否则我们将会遇到无止境的苦难。 写出下列句子中不定式的语法功能 1．Judging by his accent，the boy ___________________ a North European country，such as Norway or Finland. 从他的口音判断，这个男孩一定来自一个北欧国家，比如挪威或芬兰。 2．I can't find my purse.I ___________________ it in the supermarket yesterday，but I'm not sure. 我找不到我的钱包了。也许我昨天把它落在超市里了，但是我不确定。 3．Tom，you are too lazy.You ____________________ the work yesterday. 汤姆，你太懒惰了。你本应该昨天就做完这项工作。 4．Word came that our school _________________________________ whose topic was related to Chinese traditional customs. 消息传来，我们学校将要举行一次与中国传统习俗有关的班会。 5．Try asking yourself what you'd do if your goal __________ helpful rather than efficient. 试着问问自己，如果你的目标是帮助别人而不是提高效率，你会怎么做？ $