past ability, She couldn´t speak until she was 3 years old., ability (formal), He is able to speak over 5 languages., general possibility, It can rain here anytime of the year., a specific possibility, There´s someone at the door. It could be my Amazon parcel., suggestion, We could go for a walk after lunch., certain that something wasn´t true, The person you saw couldn´t have been Peter, he´s in Canada!, relatively certain possibility (formal), That might well be possible, but I need to check., unenthusiastic suggestion/ no better option, We may/might as well go home, I don´t think he´s coming.

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