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A modal auxiliary verb gives information about the function of the main verb that it governs. Modals have a wide variety of communicative functions, but these functions can generally be related to a scale ranging from possibility ("may") to necessity ("must"), in terms of one of the following types of modality:
epistemic modality, concerned with the theoretical possibility of propositions being true or not true (including likelihood and certainty)
deontic modality, concerned with possibility and necessity in terms of freedom to act (including permission and duty)
dynamic modality, which may be distinguished from deontic modality in that, with dynamic modality, the conditioning factors are internal – the subject's own ability or willingness to act.
The following sentences illustrate epistemic and deontic uses of the English modal verb must:
epistemic: You must be starving. ("It is necessarily the case that you are starving.")
deontic: You must leave now. ("You are required to leave now.")
