重庆巴蜀2022-2023学年八年级下学期语法讲解练习 第二节 情态动词

第二节 情态动词 一、情态动词的意义 情态动词表示说话人对某种动作和状态的看法，但情态动词不表示动作状态，所以不能单独作谓语，一般只能和其后的动词原形连用构成谓语。情态动词有过去式，但没有人称和数的变化。 情态动词 can 的用法 1. 表示会做某事，有能力做某事 过去式：could 近义词：be able to 他五岁时能说英语。He could speak English when he was 5. = He was able to speak English when he was 5. 【复习】can & be able to (1) He may study in Peking University in the future.（can/be able to） (2) I believe he will finish the work in 5 minutes.（can/be able to） (3) Believe it or not, Kerry sing very well. （can/be able to） 【区分】can & be able to ( 1 )be able to 可接在情态动词之后，而 can 不行； ( 2 )用于过去时时，could 表示“有能力但不一定做到了”，但 was/were able to 强调“有能力且做到了” 1. He didn’t agree with me at first, but I persuade him to sign the agreement later. A. could B. might C. should D. was able to 2. A big fire happened to their house. Luckily, all of the family members get out safely. A. could B. were able to C. should D. was able to 3. I believe in the future I will to have the kind of life I like. A. can B. might C. be able to D. am able to 2. 用于征求意见或请求 （情境一）你能帮我搬这个盒子吗？ —Can you help me carry the box? —Sure, I’d love/like to. —Sorry/I’m afraid not. +原因 （情境二）我能为你做什么吗？Is there anything I can do for you? —Yes, I’d like...—No, thanks. ( 1 ) 学科网（北京）股份有限公司 学科网（北京）股份有限公司 学科网（北京）股份有限公司 学科网（北京）股份有限公司 （情境三）我能在这里抽烟吗？ —Can I smoke here? —Yes, you can. —No, you can’t./ No, you mustn’t(禁止). 类似单词：may/could/might, 其语气比 can 更委婉 【注意】区别 could/ might 过去式和委婉语气： 1. —Could you pass the book to me? — . A. Yes. I could. B. Yes, I can. C. You’re welcome. D. No, I couldn’t. 2. —Could you swim at the age of five? — . A. Yes. I could. B. Yes, I can. C. You’re welcome. D. No, I can’t. 【复习】其他表请求或建议的句型： ( 1 )Why not do sth.? ②Why don’t you do sth.? ③ How about doing sth.? ④ What about doing sth.? ⑤ Let’s do sth. ⑥ Shall we do sth.? 练习： 1. How about (get) up early to catch the early bus? 2. Let’s (play) basketball together after school. 3. Why not (make) your mother a card on Mother’s Day. 4. Why don’t you (talk) to him about your worries? 5. What about (cut) out some of your