
/ 让学习更有效 新课备课备考 | 英语学科 / 让学习更有效 新课备课备考 | 英语学科 2025年牛津上海版(试用本)九年级英语上册精讲精练 Unit 2 Traditional skills 核心语法:情态动词 一、情态动词基本概念 情态动词表示说话人的态度、能力、许可或义务,具有以下特点: 后接动词原形 无人称和数的变化 不能单独作谓语 没有不定式、分词形式 二、常见情态动词分类表 类型 情态动词 基本含义 能力 can/could, be able to 能够 许可 may/might, can/could 可以 义务 must, have to, should/ought to 必须/应该 推测 must, may/might, can/could 可能/肯定 意愿 will/would, shall/should 愿意/将要 三、核心情态动词详解 1. can/could 用法 例句 注意事项 能力 I can swim. could表示过去能力 请求 Can/Could you help me could更礼貌 许可 You can go now. 口语中常用 可能性 It could rain tomorrow. 可能性较小 否定形式:cannot/can't, could not/couldn't 2. may/might 用法 例句 注意事项 许可 May I come in 正式场合使用 可能性 She may be late. might可能性更小 建议 You might try this method. 委婉建议 否定形式:may not, might not 3. must/have to 用法 例句 区别 义务 You must obey rules. 主观要求 推测 He must be tired. 肯定推测 必须 I have to work today. 客观要求 否定形式: must not/mustn't(禁止) don't have to(不必) 4. should/ought to 用法 例句 区别 建议 You should see a doctor. 常用 义务 We ought to protect nature. 语气更强 推测 They should arrive soon. 合理推测 否定形式:should not/shouldn't, ought not to 四、易混淆点辨析 1. can vs. be able to can:表示能力或许可 be able to:强调通过努力获得的能力,可用于各种时态 例句: I can speak English.(能力) After practice, I was able to swim.(通过努力获得的能力) 2. must vs. have to must:主观认为必须 have to:客观要求 例句: You must finish homework.(老师要求) I have to wear glasses.(医生要求) 3. may vs. might may:可能性较大 might:可能性较小,更委婉 五、情态动词表推测的用法 确信程度 情态动词 例句 非常肯定 must She must be at home. 可能 may/might It may rain later. 不太可能 could He could be joking. 不可能 can't That can't be true. 注意: 对现在推测:情态动词 + be/V原形 He must be sleeping. 对过去推测:情态动词 + have + 过去分词 She must have left. 六、总结口诀 "情态动词很重要,原形动词后面靠; can表能力或许可,may表允许更礼貌; must强调必须做,should建议要记牢; 否定not加后面,用法区别需明了!" 1.Li Ming can’t _____ a salad. A.make B.makes C.making D.made 2.—Can you speak English, Lingling —Yes, I _____. A.must B.can C.should 3.— Must I hand in all my homework today — No, you _____. You can finish it before Friday. A.must B.need C.mustn’t D.needn’t 4.—Hurry up, Jack! The bus is coming. —Wait a minute! You _____ cross the street until the traffic lights are green. A.need B.needn’t C.must D.mustn’t 5.—Must I finish my homework now —No, you _____. You may have a rest first. A.mustn’t B.can’t C.may not D.needn’t 6._____ you open the door for me I am carrying too many things. A.Must B.May C.Need D.Could 7.Mike, you play with fire. You burn yourself. A.won't; can't B.have got to; shouldn't C.don't have to; must D.mustn't; ... ...
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