/ 让学习更有效 新课备课备考 | 英语学科 2025年人教版（2024）新八年级英语上册精讲精练 Unit 2 Home Sweet Home 核心语法：情态动词 一、核心概念 定义：情态动词表示说话人的态度或推测，需与动词原形搭配使用。 特点： 无人称和数的变化（如：She can swim.） 后接动词原形（ He can swims. → He can swim.） 否定式直接加not（can → cannot/can't） 二、常见情态动词功能对比 情态动词 核心用法 例句 否定形式 can 能力/许可/可能性 I can play piano.（能力） cannot/can't could 过去能力/礼貌请求 Could you help me （请求） could not may 许可/可能性（正式） May I come in （许可） may not might 较小可能性 It might rain.（推测） might not must 必须/肯定推测 You must obey rules.（义务） must not shall 建议/承诺（第一人称） Shall we go （建议） shall not should 建议/义务 You should study.（建议） should not will 意愿/预测 I will call you.（意愿） will not would 过去意愿/礼貌请求 Would you like tea （请求） would not 三、核心用法深度解析 1、表能力 can/could： Now I can speak English.（现在能力） When I was five, I could ride a bike.（过去能力） 2、表许可 Can/Could/May（礼貌程度递增）： Can I use your pen （非正式） May I leave now （正式） 3、表推测（可能性从强到弱） must > will > may > might She must be at home.（灯亮着，肯定推测） It might snow tonight.（不确定推测） 4、表义务 must（主观强制）：You must wear a seatbelt. have to（客观要求）：I have to finish homework today. 四、易错点突破 1、情态动词后加to He can to swim. → He can swim. 2、must与have to混淆 must：主观认为必须 have to：客观规则要求 I must take medicine yesterday.（过去时错误） I had to take medicine yesterday. 3、can与be able to区别 can：现在能力 be able to：可通过努力获得的能力 After practice, he was able to solve the problem. 4、mustn't与needn't混淆 mustn't：禁止（=禁止） needn't：不必（=不必要） You mustn't smoke here.（禁止） You needn't hurry.（不必） 五、特殊句型 Would you mind... Would you mind opening the window （请求） 回答：Not at all./Sorry, I can't. had better（最好...） You had better wear a coat.（隐含警告） 否定：had better not do used to（过去习惯） He used to get up early.（现在不这样了） 六、记忆口诀 "情态动词表态度， 原形动词跟后头。 can表能力与许可， must强制should劝。 may/might可能性， will/would意愿求。 否定not加中间， 活用语境不用愁！" 1．— _____ I park my car here for a while — No, you mustn't. Do you see the sign “NO PARKING" A．Would B．May C．Must D．Should 2．—May I go to the cinema, mum —Certainly. But you _____ be back by 11 o'clock. A．can B．may C．must D．need 3．— I'd like a pet, but I am busy all day. — Goldfish are a good choice. You _____ feed them every day A．needn't B．can't C．shouldn't D．mustn't 4．You _____ come if you don't want to. A．shouldn't B．mustn't C．don't have to D．can't 5．—How amazing this robot is! —Wow, it has video cameras in its eyes, so it “see” and interact with people. A．may B．can C．must D．should 6．—I saw your mother in the teachers' office just now. —It _____be her. She has gone to Beijing. A．can't B．mustn't C．needn't 7．As a s ... ...
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