THE VERB	MODAL MEANING, USAGE
CAN	General ability, Potential in the present	Probability in the present and the future		Permission		Cannot- negative conclusion		Characteristics
COULD	General ability in the past, potential in the present, Unfulfilled in the past	Probability in the present and the future, perfect - in the past		Habitual permission in the past	Suggestion, irritation	Could not - negative conclusion		Past Characteristics
MAY			Probability in the present and the future, perfect - in the past	Permission	Concession
MIGHT			Probability in the present and the future, perfect-in the past	Permission in the present - uncertain	Suggestion, irritation
WILL
WOULD
SHALL
SHOULD
OUGHT to
MUST
HAVE to
NEED

---