Unit 1 Food for thought第二课时Using language课件-2022-2023学年高一英语外研版(2019)必修第二册同步教学课件

Unit 1 Food for thought Modals (1) 1.To know some modal verbs 2.To learn how to use modal verbs Lead-in 你都学过哪些情态动词呢？ can, could may, might will, would shall, should must 1. You needn’t try it if you don’t want to. 2. The man can speak two foreign languages. 3. The poor boy had to face the problem bravely. 情态动词_______独立作谓语，只能和_________一起构成谓语，具有助动词功能。 1. 情态动词的定义 不能 情态动词 (Modal verb) 情感 & 态度 动词原形 2. 情态动词的选择 情态动词 can may shall must will need dare could might should / would / / 1. 部分情态动词有时态变化（一般现在时/一般过去时）； 2. 情态动词无人称数的变化，除be able to, have to以外； be able to had better ought to have to Grammar 1 can/could的用法 1．表示能力，“能够...” Can you lift this heavy box? 4. 表示某人/某物一时的特征，“有时会，时而可能...” She can/could be tactless sometimes. 她有时太笨拙了。 2. 表示请求建议，用could比can语气更委婉 ，回答用原形。 Could you please wait me a moment, Jenny? Yes, I can. 3. 表示猜测或惊诧。 How can/could you be here? 你怎么会在这儿？ She couldn't/can't be so stupid to do that. 她不可能蠢到去做那种事吧。 Grammar 1 can/could和be able to的区别 (1) be able to 强调通过努力而获得的能力，而can则强调自身已具有的能力。 She can sing the song in English. 她能用英语唱这首歌。 He will be able to sing this song in English in a few minutes, too. 几小时之后，他也能用英语唱这首歌。 (2) be able to 强调一种结果，而can只强调一种可能。 Luckily, he was able to escape from the big fire in the end. 幸运的是，他终于逃出了大火。 If he got here a few hours earlier, I could save him. 要是他早几小时来，我还能救他。 真题链接 1. (2019 •北京卷改编) Meanwhile, with her parents' help, Moore is generally able _____________ (live) a normal teenage life. 2.(北京巻) Samuel, the tallest boy in our class, ______easily reach the books on the top shelf. A. must B. should C. can D. need to live C Grammar 2 must和have to的用法 1．表示必须(主观)，mustn’t表示禁止。 We must try our best to fight for freedom. You mustn’t smoke here. must have to 表示客观上的需要，强调被迫性，“不得不”。don’t have to 表示“不必”。 You have to be back before 10 o’clock because the train leaves at 10:05. You don’t have to knock, just walk in. 2. 表示推测，“准是，一定是”(只用于肯定句)。 She must be tired after such a lon