English verb conjugation

must

irregular
"To do as a requirement; indicates that the sentence subject is required as an imperative or directive to execute the sentence predicate, with failure to do so resulting in a failure or negative consequence, To do with certainty; indicates that the speaker is certain that the subject will have executed the predicate" — irregular English verb

Indicative

PresentPast
1st sg.mustmust
2nd sg.mustmust
3rd sg.mustmust
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Conjugation data from Kaikki.org (extracted from English Wiktionary), licensed CC BY-SA 4.0.