|ESL BLUE(s)||must (not), (don't) have to|
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|In the affirmative have to / must both express the idea of obligation.|
(It is necessary that you do something.)
However, must is only used in the present, and is never used after 'will' or 'may.'
|I must / have to get up early because I start work at 8 a.m. |
|In the negative only the verb have to (do/does not have to) expresses the idea of obligation:|
(It is not necessary that you do something.)
|You don't have to pay for children. They can come in for free.|
|In the negative must (must not / mustn't) is similar to an imperative: Do not do something:||You mustn't smoke in the corridors. (= Don't smoke in the corridors.)|
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