Mustn’t & Don’t have to (Modal verbs)

Practical English Usage Lesson 27 mustn't and don't have to. bridger-jones.com

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Mustn’t (Must not) Don’t have to
Meaning Meaning
It is not allowed. It is prohibited, dangerous, inadvisable. There is no requirement or obligation. It is not necessary.
You must not eat that. You don’t have to eat that.
= You are not allowed to eat that. It is forbidden or dangerous. = You don’t need to eat that but you can if you want to.
You mustn’t talk to Bob. You don’t have to talk to Bob.
= Do not talk to Bob. You are not allowed to talk Bob. = You can talk to Bob if you want to, but it is not necessary.
Posted in Practical English.

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