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Can I use have to/ have got to to replace must when expressing an inference? Let's take this sentence for example.

"There must be a catch"

There has to/ there's gotta be a catch.

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    Yes. All periphrastic modals -- hafta, gonna, wanna, oughta, etc) have both epistemic (logical) senses and deontic (permission) senses, just like regular modal auxiliary verbs. This turns out not to be a weird feature of English alone (unlike most topics here), but rather this diglossia is normal for modals in all languages, no matter what their grammar.. – John Lawler Apr 8 '18 at 19:50

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