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Have to, must & don't have to - do you know the differences?

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Understanding modals of necessity: must, have got to, have to [infographic]

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BBC Learning English - If you're learning English you 'must' read this! Look at our Grammar Card and learn about this little word. Then use 'must' in a sentence about an obligation

Have To' and 'must' - 6 Minute Grammar

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Have To or Must - The Differences

English Grammar - Modal Verbs - Learn English