3 years go=broken ankle & screwes sprained my akle playing tennis in auguet and it's still swollen. Had me in a cast. Is this normal?

Possibly. I think you're saying you had screws placed for a broken ankle 3 years ago, and now you've sprained your ankle last august and it's still swollen. I actually warn my patients that after bad ankle injuries (in your case, 2 of them), the swelling may actually never go away, but as long as your ankle is functional and painless and strong, i would not worry about some persistent swelling.
Broken ankle. Sounds like you need to see an ankle specialist. You should not be swollen at this point. You may need the hardware removed as well as repair of your ankle ligaments.
Immobilization. Being placed in a cast is a good option used to insure immobilization.