a verb (such as can, could, shall, should, ought to, will, or would) that is usually used with another verb to express ideas such as possibility, necessity, and permission
a verb used with another verb to express an idea such as possibility that is not expressed by the main verb
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The modal verbs in English are "can," "could," "may," "might," "must," "ought," "shall," "should," "will," and "would."
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There are a number of other words and expressions in English, apart from the main modal verbs, which also express modal meanings.