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Sr. No Modal Auxiliaries Functions, , 1k Can Ability, Permission (Formal), Request, (informal)., , 2. Could Polite Request. Past Ability., , 5: Will Futurity, Willingness, Certainty, Surety., , 4. Would Polite Request, Hypothetical Condition, Past, Habit., , = Shall Futurity, Discipline, Threat., , 6. Should Advice, Suggestion, Obligation,, , rs May Permission, Possibility, Probability., , 8. Might Remote {Weak} Possibility., , 2. Must Strong Obligation, Guess. =, , 10. Used to Discontinued Past Habit., , Ll. Ought to Moral Obligation.