What's the difference? You should see a doctor. vs You must see a doctor.
Must - stronger advice/ recommendation
What's the difference? I have to get up earlier tomorrow because..... I must get up earlier tomorrow.
I have to : external obligation e.g. because I have a meeting at 7:30. Must: I say so! I feel so! I want to get up early: this is MY, MY , MY decision!
What's the difference? You don't have to go shopping. You mustn't go shopping.
don't have to: not necessary / mustn't: prohibition
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