定义 / 说明
must 和 have to 都表示义务。简化来说，must 常表示说话者主观上认为“必须”，而 have to 更常来自规则、时间安排或外部条件。真实语境中二者差别有时不大，但这个对比能帮助学习者做选择。Must 常见于强烈个人要求或书面指令；have to 在口语中非常高频。
关键规则
- 用 must + base verb：I must go now.
- 用 have to + base verb：I have to work tomorrow.
- must 常带主观性：I must remember her name.
- have to 常来自外部要求：We have to wear a uniform.
- 否定要区分：mustn't = 禁止；don't have to = 没必要。
例句
- I must go now. - 我现在必须走。
- We have to wear badges at work. - 我们上班必须佩戴工牌。
- She has to get up early tomorrow. - 她明天必须早起。
- I must remember to call my mum. - 我必须记得给妈妈打电话。
- You don't have to come if you are busy. - 如果你忙，就不必来。
常见错误
- ❌ I must to go now. -> ✅ I must go now.
- ❌ She have to get up early. -> ✅ She has to get up early.
- ❌ We mustn't come if we are busy. -> ✅ We don't have to come if we are busy.
提示
- 记住区别：mustn't = 不允许；don't have to = 没必要。