Modal verb

A modal verb is a type of verb that contextually indicates a modality such as a likelihood, ability, permission, request, capacity, suggestion, order, obligation, necessity, possibility or advice. Modal verbs generally accompany the base (infinitive) form of another verb having semantic content.^[1] In English, the modal verbs commonly used are can, could, may, might, shall, should, will, would, ought to, used to and dare.