don't have to VS mustn't

Don't have to = Do not have to We have to 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 is a modal verb used to show that something is not allowed. When you use mustn't you are telling people not to do things. 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."

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