Must not and don't have to don't have the same meaning. Use mustn't to talk about prohibitions, and use don't have to to talk about something that is not required.
Examples:
You mustn't leave your trash here.
You don't have to lie to me. You can tell me anything.
She mustn't let her children play outside unobserved.
He doesn't have to work that hard. I don't understand why he does it.
Quiz- mustn't / don't have to: http://www.better-english.com/grammar/mustnt.htm
Posted in: Tip of the day
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