CAN: • ability in the present and future, • to express what is possible, • requests or offers, • permission, • to soften a statement or criticism, CAN'T: • logical assumptions about something that is unlikely or impossible, lack of ability in the present or future, COULD: • possibility in the present or future, • polite requests, • suggestions, • to show annoyance at something, general ability in the past, COULDN'T: • impossibility in the present, general and specific inability in the past,

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