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Mustn't or don't have to
Don't have to means that it is not necessary for someone to do something (absence of obligation).
You don't have ( it's not necessary ) to study the whole poem by heart : the first few lines will be enough.
Mustn't conveys an order, an obligation .
You mustn't smoke in a hospital (it is strictly forbidden).
English exercise "Mustn't or don't have to" created by carlabice47 with The test builder. [More lessons & exercises from carlabice47]
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