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 Mus t 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 OTHER DIFFERENCES Use HAVE TO to talk about both internal and external obligation in the PAST or the FUTURE MUST is only used in the present I had to take James to the airport this morning We had to wear an awful uniform at school I'll have to have9 rows The main difference between must and have to, is that while must is a modal verb, have to
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