Unit 3 语法：need的用法 实义动词&情态动词讲解+练习题 2025-2026学年仁爱科普版英语八年级上册

本讲义聚焦初中英语中"need的实义动词与情态动词用法"核心知识点，系统梳理实义动词"人称数变化、后接to do、否定疑问需助动词"及拓展"need doing表被动"，情态动词"无形式变化、后接原形、否定needn’t、疑问提need"的特征，并通过对比两者形式、后接成分等差异构建知识支架。 资料以"讲解+分阶练习"为特色，语法讲解配丰富例句，练习题分基础（填空）、提升（选择）、拓展（改写）三级，附详细答案。助力学生通过辨析与练习提升语言理解表达能力，对比差异培养思维品质，自主练习巩固学习能力。课中辅助教师清晰授课，课后学生可自查补漏，强化知识掌握。

need的用法（实义动词&情态动词） 讲解+练习题 need有实义动词和情态动词两种用法。 一、语法核心讲解 （一）need作实义动词的用法 need作实义动词时，具备普通实义动词的所有特征，具体用法如下： 1. 人称和数的变化：主语为第三人称单数时，need要变为needs；过去式为needed。 2. 后接成分：只能接带to的不定式，即need to do sth.，表示“需要做某事”。 3. 否定形式：需借助助动词don’t/doesn’t/didn’t，构成don’t/doesn’t/didn’t need to do sth.。 4. 疑问形式：需借助助动词do/does/did，构成Do/Does/Did + 主语 + need to do sth.?。 5. 拓展用法：need还可接doing形式，表被动含义，相当于need to be done，意为“某物需要被……”。 例句： · 肯定句：I need to drink more water every day. / She needs to finish her homework before dinner. · 否定句：We don’t need to go to school on weekends. / He didn’t need to take a taxi yesterday. · 疑问句：Do you need to buy some fruit? / Does he need to see a doctor? · 被动拓展：The bike needs repairing. = The bike needs to be repaired. （二）need作情态动词的用法 need作情态动词时，用法与can/may/must等情态动词一致，具体特征如下： 1. 无形式变化：无论主语是第几人称、单数还是复数，都用need原形，也无过去式变化。 2. 后接成分：只能接动词原形，即need do sth.，该用法极少用于肯定句。 3. 否定形式：直接在need后加n’t，构成needn’t do sth.，表示“不必做某事”。 4. 疑问形式：将need提至句首，构成Need + 主语 + do sth.?，答语中肯定用must，否定用needn’t。 例句： · 否定句：You needn’t hurry. There’s still plenty of time. / He needn’t come early tomorrow. · 疑问句：Need we hand in the papers today? / Need she go with us? · 答语：—Need I call him now? —Yes, you must. / No, you needn’t. （三）实义动词与情态动词用法的核心区别 1. 形式变化：实义动词need有人称、数和时态的变化，情态动词need无任何形式变化。 2. 后接内容：实义动词后接to do不定式，情态动词后接动词原形。 3. 否定和疑问：实义动词需借助助动词，情态动词直接通过自身变形实现否定和疑问。 4. 句式应用：实义动词可用于肯定、否定、疑问三种句式；情态动词主要用于否定句和疑问句，肯定句中一般用must/have to替代。 配套练习题 （一）基础题：用need的适当形式填空 1. They _______ (need) to clean the classroom after school. 2. You _______ (not need) to bring your books tomorrow. 3. _______ he _______ (need) to take part in the meeting? 4. My bike is broken, it _______ (need) mending. 5. She _______ (needn’t) get up early today, it’s Sunday. 6. We _______ (not need) to wait for him, he has already left. 7. _______ you _______ (need) to borrow a pen from me? 8. The window _______ (need) to be cleaned, it’s too dirty. （二）提升题：选择正确的选项填空 1. We _______ buy any milk, there is plenty in the fridge. A. needn’t to B. don’t need to C. doesn’t need 2. —_______ I finish the task now? —No, you _______. You can do it tomorrow. A. Need; needn’t B. Do; needn’t C. Need; mustn’t 3. The flowers _______ watering, or they will die. A. need B. need to C. needn’t 4. He _______ to go to the hospital, because he feels well. A. doesn’t need B. needn’t C. need 5. —Does she _______ to attend the party? —No, she _______. She has to look after her sister. A. need; needn’t B. needs; doesn’t C. need; doesn’t need （三）拓展题：按要求改写句子 1. I need to wash my clothes.（改为否定句） 2. She needs to finish the work before 5 pm.（改为一般疑问句） 3. Need they go to the park this afternoon?（作否定回答） 4. The room needs cleaning.（改为同义句） 5. We need to study hard for the exam.（改为情态动词的否定形式） 三、练习题参考答案 （一）基础题 1. need 2. don’t need 3. Does; need 4. needs 5. needn’t 6. don’t need 7. Do; need 8. needs （二）提升题 1. B 2. A 3. A 4. A 5. C （三）拓展题 1. I don’t need to wash my clothes. 2. Does she need to finish the work before 5 pm? 3. No, they needn’t. 4. The room needs to be cleaned. 5. We needn’t study hard for the exam. 1 学科网（北京）股份有限公司 $