The prescription, and the frequent use, is this: 'have to' refers to commands or requirements imposed from an outside authority and 'must' refers to an inner necessity or a self-requirement. However, many native speakers tend to use 'have to' in all instances.
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Mister MicawberThe prescription, and the frequent use, is this: 'have to' refers to commands or requirements imposed from an outside authority and 'must' refers to an inner necessity or a self-requirement. However, many native speakers tend to use 'have to' in all instances.I agree, though 'must' is still commonly used in British English.
fivejedjon With first person 'I', people sometimes use 'have to' when there is in fact an inner necessity or self requirement. They do this to suggest that the requirement comes from an outside authority, in order to give the impression that they are reluctant to do what is required:Yes, indeed: an incisive observation.