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Mustn't and don't have to
Modal verbs
Must, mustn't, have to and don't have to are modal verbs. This means they are always followed by a bare infintive verb. Unlike most modal verbs, have to and don't have to change verb form when the subject pronoun changes. For example, becoming has to and doesn't have to or had to and didn't have to.
- I must go.
- We mustn't go.
- You have to go.
- He doesn't have to go.
Must and have to
Both must and have to refer to obligation. They explain what needs to be done.
- You must stop smoking. It will kill you.
- You have to go to school. It's the law.
Mustn't
Mustn't also refers to obligation, but in this case, it tells us what cannot be done.
- You mustn't talk to your mother like that.
- He mustn't leave the house until I come home.
- We mustn't eat any more chocolate.
Don't have to
Don't have to explains to us that there is no obligation to do something. As a result, we have free choice! You can choose to do this thing or not.
- You don't have to go to school if you are sick.
- She doesn't have to come to the party, if she doesn't want to.
- I don't have to know all the moves to win the game!
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To do
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