Unit2语法讲解及习题：Modal verbs (had better and need)2025-2026学年沪教版(五四学制）英语七年级上册

沪教英语（五四学制）七上Unit2语法讲解及习题 Modal verbs (had better and need) 一、语法核心讲解 本单元重点语法是情态动词 had better 和 need 的用法，主要用于给出建议和表达必要性。 1. had better (not) 核心含义：表示“最好（不）做某事”，用于向对方给出强烈的建议、忠告或提醒，语气比 should 更直接、恳切，暗含“如果不这么做，可能会有不好的结果”。 核心结构： · 肯定形式：had better + 动词原形（无to） · 否定形式：had better not + 动词原形（无to，否定词not直接加在better后，无需借助助动词） 缩写形式： · had better → 'd better（主语为人称代词时常用，书面、口语均可） · had better not → 'd better not（否定形式的缩写和肯定形式一致） 关键用法注意点： 无人称和数的变化：不管主语是第一人称（I/we）、第二人称（you）还是第三人称（he/she/it/they），都统一使用had better，不能根据主语变成has better/have better。 例：I had better study hard. / He had better study hard.（不能说He has better study hard.） 后接动词原形：必须直接加不带to的动词原形，这是情态动词的典型特征，切记不能加to。 错例：You'd better to go home. 正例：You'd better go home. 句式使用限制：通常只用于陈述句中给出建议/忠告，一般不用于疑问句（若想表达“我最好做某事吗？”，常用Should I...? 代替）。 had的特殊性：此处的had无“过去式”含义，只是固定搭配，该结构可用于现在、将来的语境，不表示过去。 例句 ： "I had better give up!" she cried. 她喊道：“我最好放弃吧！” He'd better not follow others blindly and make fun of that poor kid again. 他最好不要盲目跟风，也不要再取笑那个可怜的孩子了。 You'd better write a diary to cool down. 你最好写日记冷静一下。 2. need (n't) need是兼类词，可作情态动词也可作实义动词，本单元重点讲解其情态动词用法，实义动词用法作为补充理解，避免混淆。 （1）情态动词 need (n't) 核心含义：表示“需要”或“不必”，主要用于否定句和疑问句，肯定句中一般不用情态动词need（肯定句表“需要”常用实义动词need）。 核心结构： 否定形式：needn't + 动词原形（无to），表“不必做某事”，是本单元核心考点 疑问形式：Need + 主语 + 动词原形?，表“某人需要做某事吗？” 缩写形式：need not → needn't（口语、书面通用） 关键用法注意点： 无人称和数的变化：和had better一致，不管主语是何人称、单复数，情态动词need都保持原形，后接动词原形。 例：She needn't go now. / They needn't go now. 句式使用限制：仅用于否定句、疑问句，肯定句中不用，避免错用。 错例：I need finish my homework now. 正例（实义动词）：I need to finish my homework now. 疑问句的回答：以Need...?开头的一般疑问句，否定回答用needn't（不必），肯定回答常用must/have to（必须）。 例：—Need I go there at once? —No, you needn't. / Yes, you must. （2）实义动词 need（补充区分，避免混淆） 核心含义：表示“需要”，可用于肯定、否定、疑问句，是日常使用中更通用的形式。 核心结构： 肯定形式：主语 + need + to do sth. / 名词（有人称和数的变化） 否定形式：主语 + don't/doesn't/didn't + need + to do sth. / 名词 疑问形式：Do/Does/Did + 主语 + need + to do sth. / 名词? 关键区别：有人称和数的变化，后接to do（接动词时），否定/疑问需借助助动词do/does/did。 例句对比（情态动词vs实义动词）： 情态动词（否定）：You needn't worry.（你不必担心。） 实义动词（否定）：You don't need to worry.（同义句，本单元句型转换考点） 实义动词（肯定）：I need to buy a new pen.（我需要买一支新钢笔。） 她不必太在意自己的身高。 3. 用法对比与总结 情态动词 核心功能 核心结构 例句 核心考点 had better 给出强烈建议、忠告（可表“不做某事的忠告”） had better + 动词原形 had better not + 动词原形 You'd better not be late. 1. 无人称数变化 2. 后接动词原形 3. 否定直接加not needn't 表达“不必做某事”（情态动词用法） needn't + 动词原形 You needn't come early tomorrow. 1. 无人称数变化 2. 后接动词原形 3. 仅用于否定句 二、综合练习题 题型一：用 had better / had better not 填空 1. You ____________________ (eat) too much junk food. It's bad for your health. 2. It's raining outside. You ____________________ (take) an umbrella with you. 3. He is very tired. He ____________________ (stay) up late tonight. 4. The movie is about to start. We ____________________ (hurry) up. 5. You ____________________ (talk) to your parents when you have problems. 6. It's dangerous. You ____________________ (go) there alone. 7. You look ill. You ____________________ (see) a doctor. 8. You ____________________ (forget) your homework again. The teacher will be angry. 9. It's cold outside. You ____________________ (wear) a warm coat. 10. You ____________________ (make) the same mistake again. 题型二：用 needn't 和括号内动词的适当形式填空 1. You ____________________ (finish) the work today. You can do it tomorrow. 2. She ____________________ (worry) about the exam. She has prepared well. 3. We ____________________ (buy) any food. There is plenty in the fridge. 4. He ____________________ (come) to the meeting if he is busy. 5. You ____________________ (call) me. I will call you later. 6. They ____________________ (leave) early. The train doesn't leave until 10 o'clock. 7. You ____________________ (pay) for the ticket. It's free for students. 8. She ____________________ (clean) the room. I did it this morning. 9. We ____________________ (hurry). There is still plenty of time. 10. You ____________________ (remember) all the words. Just understand the main idea. 题型三：单项选择 1. You'd better ___________ late for school again. A. not be B. not to be C. be not D. to not be 2. — Must I finish my homework now? — No, you ___________. You can do it after dinner. A. mustn't B. can't C. needn't D. may not 3. You ___________ take an umbrella. It's not going to rain. A. needn't B. can't C. mustn't D. shouldn't 4. He had better ___________ the doctor at once. A. see B. to see C. seeing D. sees 5. You needn't ___________ about me. I'm fine. A. worry B. to worry C. worrying D. worried 6. It's very cold outside. You'd better ___________ your coat. A. put on B. to put on C. putting on D. puts on 7. — Need I go there now? — No, you ___________. A. needn't B. mustn't C. can't D. shouldn't 8. You'd better not ___________ in the sun. It's bad for your eyes. A. read B. to read C. reading D. reads 题型四：句型转换 1. You should go to see the doctor. (改为 had better 结构) You ______________ ______________ ______________ the doctor. 2. You don't need to finish the work today. (改为 needn't 结构) You ______________ ______________ the work today. 3. You should not smoke in public places. (改为 had better not 结构) You ______________ ______________ ______________ in public places. 4. Must I hand in my homework now? (作否定回答，用 needn't) No, ______________ ______________. 5. You needn't be afraid of making mistakes. (改为同义句) You ______________ ______________ ______________ be afraid of making mistakes. 三、答案与解析 题型一：用 had better / had better not 填空 1. had better not eat 2. had better take 3. had better not stay 4. had better hurry 5. had better talk 6. had better not go 7. had better see 8. had better not forget 9. had better wear 10. had better not make 题型二：用 needn't 和括号内动词的适当形式填空 1. needn't finish 2. needn't worry 3. needn't buy 4. needn't come 5. needn't call 6. needn't leave 7. needn't pay 8. needn't clean 9. needn't hurry 10. needn't remember 题型三：单项选择 1. A (had better not + 动词原形，be late为固定搭配，表“迟到”) 2. C (对must开头的一般疑问句，否定回答用needn't，表“不必”；mustn't表“禁止”，不符合语境) 3. A (needn't表示“不必”，结合后句“不会下雨”，符合句意) 4. A (had better + 动词原形，see the doctor为固定搭配，表“看医生”) 5. A (needn't + 动词原形，worry about为固定搭配，表“担心”) 6. A (had better + 动词原形，put on为固定搭配，表“穿上”) 7. A (对Need开头的一般疑问句，否定回答用needn't，为固定用法) 8. A (had better not + 动词原形，read in the sun表“在阳光下看书”) 题型四：句型转换 1. had better go to 2. needn't finish 3. had better not smoke 4. you needn't 5. don't need to ( 1 ) 学科网（北京）股份有限公司 $