have to must –

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have to, don't have to, must, mustn't - Test-English

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Learn English Should vs. Need to vs. Have to vs. Ought to vs

Must vs. Have to - What is the difference? - English Grammar

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Must vs. Have to - What is the difference? - English Grammar

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In plain English : SHOULD, MUST OR HAVE TO?

have to, don´t have to, must, mustn´t