Definition
A modal verb is a type of auxiliary verb that adds specific meaning to the main verb, expressing necessity, possibility, permission, or ability. Think of them as helpers that modify the main verb's mood. Unlike regular verbs, they don't change form to agree with the subject. Common modal verbs include 'can,' 'should,' 'must,' and 'might.' They give extra context, such as 'You *should* study' or 'I *can* sing.' They never stand alone as the main verb. They act as signposts, guiding how we understand the action.