Modal Auxiliary Verbs Detailed Notes, British Grammar Reference, and Worked Examples Reference Notes — Traditional British Grammar (Wren & Martin, Nesfield) and Cambridge Grammar of the English Language On this page What Are Modal Verbs? Grammatical Properties of Modals Why Modals Confuse Learners Each Modal — Meaning and Examples The Classical Shall/Will Rule Semi-Modals (Marginal Modals) 4-Step Strategy for Exam Accuracy Practice Sentences with Explanation Quick Revision Checklist 1. What Are Modal Verbs? Modal verbs (also called modal auxiliaries ) are a closed class of helping verbs that combine with the base form of a main verb to express the speaker's attitude toward an action — ability, possibility, permission, obligation, necessity, or intention — rather than simply marking tense. In traditional British grammar (Wren & Martin), modals fall under Auxiliary Verbs , a subclass of the verb, alongside primary auxiliaries ( be, have, do ). The nine core modals: can, co...