where we use must and have to?
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Answer:
We use have to / must / should + infinitive to talk about obligation, things that are necessary to do, or to give advice about things that are a good idea to do. Must and have to are both used for obligation and are often quite similar. They are both followed by the infinitive. I must go now. / I have to go now.
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Have to mainly expresses general obligations, while must is used for specific obligations: I have to brush my teeth twice a day. I must tell you something. Important: To express obligation, duty or necessity in the future or the past, must and need are not used.