【弯道超车】Unit 8 Safe and sound 核心语法之情态动词表建议或义务-2025年译林版（2024）新八年级英语上册精讲精练 (含答案解析)

/ 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年译林版（2024）新八年级英语上册精讲精练 Unit 8 Safe and sound 核心语法：情态动词表建议或义务 一、核心概念 情态动词 用来表示说话人的语气和态度。本单元重点学习用情态动词表达建议或义务。 二、表示建议或义务的情态动词 情态动词 语气强度 含义 例句 should ★★★ 应该（建议） You should study harder. ought to ★★★★ 应当（义务） You ought to help others. must ★★★★★ 必须（强制） You must finish your homework. had better ★★★★ 最好（强烈建议） You'd better see a doctor. 三、详细用法解析 1. should 表示建议或劝告 语气较为委婉 You should get more rest.（你应该多休息。） Should I call him （我应该给他打电话吗？） 2. ought to 表示道义上的义务 语气比should更强 We ought to respect our teachers.（我们应当尊敬老师。） You ought not to be late.（你不应该迟到。） 3. must 表示强烈的义务或必要性 带有强制性意味 You must wear a seatbelt.（你必须系安全带。） Must I go now （我必须现在去吗？） 4. had better 表示强烈的建议 带有警告意味 You'd better hurry up.（你最好快点。） We'd better not be late.（我们最好不要迟到。） 四、否定形式 情态动词 否定形式 例句 should should not/shouldn't You shouldn't smoke. ought to ought not to/oughtn't to You ought not to waste time. must must not/mustn't You mustn't tell anyone. had better had better not You'd better not go out. 五、易错点分析 1、ought to 的否定形式错误 You ought not smoke.（错误） You ought not to smoke.（正确） 2、had better 后接动词形式错误 You had better to go now.（错误） You had better go now.（正确） 3、must 与 have to 混淆 must：主观要求 I must study hard.（我自己要求） have to：客观需要 I have to wear glasses.（视力需要） 六、记忆口诀 “情态动词表建议，should ought to must记。 should表应该语气轻，ought to义务道义明。 must表必须强制意，had better强烈建议提。 否定not加后面，语气强度要分清。 多练多用多体会，建议义务表达准。” 1．To ensure the safety of all students, the school has a rule that you _____ leave the classroom during the class without permission. A．must B．mustn’t C．don’t have to D．can 2．You put the seatbelt（安全带）on before driving. A．can B．must C．would D．could 3．—Excuse me, _____ you show me the way to the Jiajia Hotel —Sorry, I am new here. A．should B．must C．could D．may 4．—_____ I use your pen —Sure, here you are. A．Must B．Should C．Can 5．—Can she go out on school nights —No, she _____. And I can’t, either. A．doesn’t B．don’t C．can’t D．isn’t 6．Last year I _____ drive. I used to take the bus. A．could B．couldn’t C．should D．shouldn’t 7．You _____ eat in the classroom. A．don’t B．can’t C．not D．no 8．I _____ ride a bike, but I _____ drive a car. A．can; can B．can't; can't C．can; can't D．am; am not 9．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; might 10．—_____ I speak to Teng Fei —Sorry, he’s not in. A．Could B．Must C．Should 11．—Must I finish my homework now —No, you _____. You may hav ... ...