Plaster cast for grade 3 ankle sprai for 2-4 weeks. when cast comes off who'll i still have pain will i be able to walk. what next step?

Hard to say: You were given a cast because you had a severe sprain. So it depends on how easily it heals. The range 2-4 weeks indicates that it is hard for anyone to say how long it will be needed. So wait and see, if at 2 weeks your ankle still hurts, you will likely be advised to continue it The goal is no pain, if it still hurts at 4 weeks, your doctor will re-examine and decide what to do next,