ما الفرق بين :must/have to ؟

[ابو بيشو]

واخيرا استخدام اخر :

We can use 'must' to show that we are certain something is true. We are making a logical deduction based upon some clear evidence or reason.
• There's no heating on. You must be freezing.
• You must be worried that she is so late coming home.
• I can't remember what I did with it. I must be getting old.
• It must be nice to live in Florida.