Is it really very helpful to you to divide the uses of words like can and could into groupings like 'ability', 'possibility', 'capability', 'opportunity', 'eventuality', 'potentiality', and so on and so forth? The differences between these are very subtle, even to native speakers. And often two or more of these concepts are involved within the same sentence.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.