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All modal verbs are auxiliary verbs, which means they can only be used with a main verb. Modal verbs cannot be a main verb.
They are used to express ideas such as possibility, prediction, speculation, deduction and necessity.
A modal verb combines with another verb to indicate mood or tense. A modal verb expresses necessity, uncertainty, ability, or permission.
Most linguists agree that there are 10 core or central modals in English: can, could, may, might, must, ought, shall, should, will, and would. Other verbs–including need, had better and invariant be–may also function as modals (or semi-modals).
Unlike other auxiliaries, modals have no -s, –ing, -en
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