don't have to vs mustn't

don't have to vs mustn't
  Don't have to = Do not have to
  We use don't have to to say that there is no obligation or necessity to do something.
  For example: "You don't have to do the exercises at the end of this page."
  Mustn't = must not
  We use mustn't to show that something is not allowed. When you usemustn't you are telling people not to do something. It has the same force as don't , as in: Don't do that!
  For example: "You mustn't drink if you're going to drive."

English dictionary of common mistakes and confusing words. 2014.

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