【弯道超车】Unit 7 Fun after school 核心语法之情态动词 have to 的用法-2025年沪教版（2024）新七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年沪教版（2024）新七年级英语上册精讲精练 Unit 7 Fun after school 核心语法：情态动词have to的用法 一、 have to 的核心含义 have to 的核心含义是 “必须”、“不得不”。它表示由于外部规则、法律、义务或客观情况的要求而必须做某事，强调客观必要性。 中文可理解为： “不得不”、“只能”、“得”。 例句： I have to wear a uniform at school. 我在学校必须穿校服。（校规要求） It's raining. We have to stay at home. 下雨了。我们不得不呆在家里。（天气客观因素） She has to go to work every day. 她得每天去上班。（工作需求） 二、 have to 的各种形式 have to 是“半情态动词”，它有人称、数和时态的变化！这是它与 must, can 等情态动词最大的不同。 人称/时态 肯定句 否定句 疑问句 现在时 主语 + have/has to + 动词原形 ... 主语 + don't/doesn't have to + 动词原形 ... Do/Does + 主语 + have to + 动词原形 ... I / You / We / They have to go don't have to go Do you have to go He / She / It has to go doesn't have to go Does she have to go 过去时 主语 + had to + 动词原形 ... 主语 + didn't have to + 动词原形 ... Did + 主语 + have to + 动词原形 ... 所有人称 had to go didn't have to go Did you have to go 重要提示： 第三人称单数（he, she, it）用 has to，否定用 doesn't have to，疑问句用 Does ... have to ... 。 过去时，所有人称都用 had to，否定用 didn't have to，疑问句用 Did ... have to ... 。 三、 have to 的否定形式：don't have to don't have to 的含义是 “不必”。它表示没有义务或必要去做某事，相当于 needn't。 例句： You don't have to finish it today. 你不必今天完成。 She doesn't have to go to school on Sunday. 她星期天不必去上学。 We didn't have to wear a uniform yesterday. 我们昨天不必穿校服。 四、 核心辨析：have to vs. must 这是七年级最重要的语法点之一，两者的区别必须掌握。 must have to 含义 必须（强调个人主观认为有必要） 必须，不得不（强调客观外部要求） 否定形式 must not (mustn't) 禁止，不准（语气非常强） do not have to (don't have to) 不必（= needn't） 例句（肯定） I must study hard. 我必须努力学习。（我自己觉得有必要） I have to wear glasses. 我不得不戴眼镜。（医生要求的/我看不清） 例句（否定） You mustn't play with fire. 你不准玩火。（这是危险的！） You don't have to tell him. 你不必告诉他。（没这个必要） 简单总结： must = 我觉得必须 have to = 外界要求我必须 mustn't = 千万别（做坏事） don't have to = 不需要（做某事也没关系） 1．Nancy can't come to your party because she _____ do her homework. A．has to B．can't C．doesn't have to D．can 2．Eating too much salt or sugar _____ cause illness. A．should B．must C．might D．have to 3．—Can you come to my birthday party —Sorry, I can’t, because I _____ go to school. A．have to B．can C．can’t D．don’t 4．My bike is broken(坏了), so I _____walk to school. A．have to B．must C．has to D．need 5．—Jane, can you come to my birthday party —I’d love to. But I _____ look after my little sister because my parents are away. A．can’t B．mustn’t C．have to D．don’t have to 6．Lily _____ home on time. A．has to come to B．has to come C．have to come to D．have to ... ...