Must
/mˈʌst/
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Definition
(verb) 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.
Sentence Examples
We must learn to live together as brothers, or we will perish together as fools.
Seeing that you're not surprised, I think you must have known.
CEFR Practice Quiz
You ____ remember to bring your passport to the airport, otherwise you will not be able to board your international flight to London.