Modal Verbs in English

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HAVE TO	Unwillingness, forced circumtances
WOULD	Wish (with “to like”), polite request, a habit of the past
SHOULD	Necessity, advice, blame, recommendation, reproach, regret
USED TO	Repeated action in the past
OUGHT TO	Moral duty, insistent advice, strict recommendation
NEED	(un)necessity
BE TO	Obligation arising out of arrangement or agreement