I ______ new clothes for school.
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  • "Have to" is used to show obligation. "Must" has the same meaning but cannot always be replaced by "have to".

    I have to wash the dishes because my girlfriend wants me to.
  • In the negative form, we use "don't have to" to say that there is no obligation, but we use "mustn't" to say there that there is a strong obligation to NOT do something.

    My friend doesn't have to go to work tonight, so we're going to go to a party. You mustn't cheat on your test, or your teacher will be angry.

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