Answer:
i'll help out so the other person could get brainliest lol, so the way you can tell if someone sprained their ankle, is if their limping, swelling, grunting when they walk, or they just simply tell you their leg hurts,
you get sprain an ankle if you place too much weight on it, so lets say if you were doing squats with weights, or if you're running and you kind bend you ankle a little too far
this could be helped, with a bit of ice, or just relaxing it a bit to relieve it, kind like when someone takes in a deep breath