CAN - -Permission - Possibility - Ability , COULD - -Polite Request - Specific situation, MAY - -Permission - Possibility , MIGHT - -Possibility, MUST - -Obligation - Forbidden - Advice, NEED TO/HAVE TO - -Strong necessity - Obligation, SHOULD/OUGHT TO - -An obligation - General advice, WAS ABLE TO - -Ability or Innability in the past,

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