Modal verb, special auxiliary verb, Ability, can or could, Permission or possibility, may might or could, Obligation, must, Advice, should, Request, would or could, Key formula, modal verb plus base verb, Third person rule, no -s added to modals, Infinitive rule, no to after modal verbs, Question rule, no do or does needed, Can, expresses ability, Must, expresses obligation, Should, expresses advice, Might, expresses possibility

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