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Have to / Must
Subject + have / has to + present tense verb phrase
Subject + must + present tense verb phrase
You have to wear a uniform.
I must be at work by 9am.
Have to / must - explain
Have to = very important, something bad will happen if you do not do it, you have no choice.
Must = something that would be very good if you did it. You have a choice, but you should do it.