v (context|modal|_|auxiliary|defective) to do with certainty; (non-gloss definition|indicates that the speaker is certain that the subject will have executed the predicate)
v (context|modal|_|auxiliary|defective) to do as a requirement; (non-gloss definition|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 negative consequence)