ESL Blues | must (not), (don't) have to |
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Click here to see the troubleshooting page and here to see the rules. Position your mouse over image for more information.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. I will |
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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