It's necessary/obligatory.: I have to tidy my room once a week., You must switch your phone off in the cinema., You have to change your shoes at school. , You must wake up at 6 everyday to be healthy., You must go to school every day. , It's NOT necessary/obligatory, but you can do it if you want.: I don't have to tidy the kitchen. , You don't have to eat at school. , You don't have to go to bed early. , You don't have to do sport at school. , You don't have to wake up early at weekend. , You can’t do it, it's prohibited. : We mustn't bring food to a restaurant. , You mustn't use your phone at school. , You mustn’t eat in class., You mustn't listen to loud music at night. , You mustn't shout at school.,

must/have to vs mustn't vs don't have to

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