Answered By: Writing Center
Last Updated: Apr 20, 2015     Views: 1

Have to and must connote obligation. For example: We have to go to the art exhibit. We promised him we would. We must go to the art exhibit. We promised him we would.

While the two are similar, their negative forms are significantly different. For example: 

We must not go to that place. I have heard bad things about it. (obligatory) 

We don't have to eat outside unless you really want to. (not obligatory)

 

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