UNIT 1 Section Ⅱ Using language（课件PPT）-【优化指导】2024-2025学年新教材高中英语必修第二册（外研版2019）

UNIT 1　Food for thought (单元主题语境：人与自我——饮食健康) Section Ⅱ　Using language 情态动词(1) UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 做成 不敢 不得不 最好(不) 没必要 需要 UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 原形 人称 后 UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 时态 can 过去 UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 疑问 敢 UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 could dare UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 did not dare (to) see Being able to UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 不得不 UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 最好 UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 需要 必需 UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 to live to be repaired/repairing have to walk home UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 had better not eat too much need to be ready UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 could should had better could UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 be able to had to could UNIT 1　Food for thought 英语　必修　第二册　W　 返回导航 谢 谢 [观察] 1. ...I was able to hold a knife and fork—and chopsticks! 2．But there are still some dishes that Dad dare not try even after many years of marriage to my mother. 3. ...Mum and I just have to find a way to get him into the kitchen! 4．...we'd better not eat too much roast food as it may make us suffer from heat inside our bodies ... 5．“You needn't try it if you don't want to，”Mum said ... [探究] 在以上这些例句中，黑体部分的含义如下： 1．be able to表示不仅“能”而且“______”，强调通过努力有能力做到。 2．dare not表示“______”做某事。 3．have to表示“________”做某事，强调客观需要。 4．had better (not)表示“___________”做某事。 5．needn't表示“_______”做某事，need意为“______”，是情态动词，另外need也可作实义动词。 一、基本特征 [感知] 1．Air pollution is becoming increasingly serious，so we must take measures to control it. 空气污染正变得越来越严重，所以我们必须采取措施加以控制。 2．(2023·全国乙卷)As time went by，she thought more and more that she could make the London Games—and win. 随着时间的流逝，她越来越相信自己能够参加伦敦奥运会，并且获胜。 3．(2023·全国甲卷)These can't be any good，we thought. 我们认为它们一定不好。 [探究] 1．情态动词有一定的词义，后接动词______，不能单独作谓语，需和实义动词或系动词一起作谓语。 2．情态动词一般无______和数的变化，个别情态动词有现在时和过去时两种时态变化。 3．构成否定句时，not放在其_____面。 二、用法 (一)be able to的用法 [感知] 1．(2023·全国乙卷)Some chapters of this book are able to do just that，but in many cases we simply can't. 这本书的一些章节能够做到，但在许多情况下，我们根本做不到。 2．It is a good idea to learn as much as possible about Chinese culture so that you will be able to avoid culture shock. 尽可能多地学习中国文化是个好主意，这样你就能避免文化冲击。 3．The aircraft was able to fly over the endless white plains without difficulty. 飞机可以毫无困难地飞过茫茫无际的白色原野。 4．(2022·新高考Ⅰ卷)Everyone can play a part in reducing waste. 每个人都可以在减少浪费的过程中发挥作用。 [探究] 1．be able to后跟动词原形，表示具体的能力，与______的用法相近。 2．be able to有更多的_____形式，can只有一般现在时和一般过去时。 3．was/were able to do sth.表示_____成功做成了某事，相当于succeeded in doing sth.。could仅表示客观上有某种能力，不说明实施该能力后的结果。 be able to与can/could的区别 be able to还可以与某些情态动词连用(通常不与can连用)，be able to有非谓语动词形式而can/could没有。 You might be able to persuade him. 你也许能够说服他。 His voice was carefully controlled，but Harry could sense his excitement. 他的声音是小心控制的，但哈利能感觉到他的激动。 (二)dare的用法 [感知] 1．Dare you tell her the truth? 你敢告诉她真相吗？ 2．I daren't ask her this question. 我不敢问她这个问题。 [探究] dare意为“____”，后接动词原形，通常只用于否定句、______句以及if或whether之后，一般不用于肯定句。 dare也可用作实义动词，意为“敢于”，可以有词形变化，可用于各类句型，其后接不定式(有时也可省略to)。 Does she dare to go alone? 她敢自己去吗？ [即练] 单句填空/完成句子 1．Her daughter _____ walk when she was nine months old. 2．The children don't ____(to) make a sound while their parents are sleeping. 3．我低下头，不敢看老师和其他同学的反应。 I lowered my head and _____________________ the reactions of the teacher and other students. 4．能解出这道数学题使他感到自豪。 _____________ work out the maths question made him proud. (三)have to的用法 [感知] 1．I have to attend an important meeting this afternoon. 今天下午我不得不参加一个重要的会议。 2．(2023·全国乙卷)Gabby Douglas had to leave everything she knew best. Gabby Douglas不得不离开她所熟知的一切。 [探究] have to表示客观上的需要，强调被迫性，有“_______”的含义。have to可用于多种时态，形式随时态变化而变化。 must和have to都表示“必须”，但must侧重说话者的主观看法，认为有必要或者有义务去做某事。 Everyone must keep the law. 人人都要守法。 (四)had better的用法 [感知] 1．You had better make more friends through face­to­face communication. 你最好通过面对面的交流交更多的朋友。 2．You had better not miss the last bus. 你最好不要错过末班公共汽车。 [探究] had better意为“________”，用于表示对别人的劝告、建议或表示一种愿望。否定式是把not直接放在had better的后面。 (五)need的用法 [感知] 1．If we need pay for it，maybe we have other choices. 如果我们需要付钱，也许我们还有其他选择。 2．You need not tell the entire truth，but you must not lie. 你不必说出全部真相，但你一定不许撒谎。 [探究] need用作情态动词，表示“______”或“______”，通常用于否定句、疑问句、条件句。 need用作实义动词时，后面可以加to do/doing/to be done。need doing＝need to be done，表示被动。另外，need作实义动词时还可以直接跟名词。 It is a question that needs very careful consideration. 这个问题需要慎重考虑。 The trees need watering. →The trees need to be watered. 这些树需要浇水了。 [即练] 单句填空/完成句子 1．Adults need _______(live) their own lives and that's difficult with children. 2．I think these houses need ________________________(repair). 3．如果你不得不在深夜独自走回家，一定要走光线充足的地方。 If you _________________ alone late at night，stick to well­lighted areas. 4．我们最好不要一次吃太多，虽然它可能是我们最喜欢的食物。 We ___________________________ at a time though it may be our favorite food. 5．他们还需要准备好用英语接受国际记者的采访。 (2023·新课标Ⅱ卷)They also ________________ to give interviews in English with international journalists. 用适当的情态动词填空 Miss Fang 1._____ not read for very long with her eyes hurt.Her mother told her that she 2.______ go to hospital and see a doctor.“You 3.__________ see a doctor as soon as possible，” her mother said. When Miss Fang had free time，she went to hospital.The clerk said that the doctor 4._____ see her at 3：30. Miss Fang replied that she would not 5.__________ be there at 3：30，because she 6.______ have an important test then.She asked the clerk if she 7._____ arrange the examination at about ten tomorrow. $$