As we have studied in unit 3 "must" and "have to" have a very similar meaning, though "have to" is more common for general, external obligations and "must" for specific or personal obligations.However, there is a huge difference in the negative forms.We use 'mustn't' to express strong obligations not to do something, and 'don't have to' to state that there is no obligation or necessity.
exercise 1
exercise 2
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