[ابو بيشو]

ما الفرق بين must/have to؟

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We use 'must' to express a strong obligation. When we use 'must' this usually means that some personal circumstance makes the obligation necessary (and the speaker almost certainly agrees with the obligation.)
• I must go to bed earlier.
• They must do something about it.
• You must come and see us some time.
• I must say, I don't think you were very nice to him.