[clevermae]

I guess he really needs you to give him a push. I agree with what the others suggest. Give him reading assignments or homework, let him record the words he doesn't know or understand, or ask him about what he had read afterward. If he reasons that he is busy and doesn't have the time to read and tackle other learning medium, tell him that he needs to allot a certain amount of time each day for this if he really wants to improve. Otherwise, you can no longer do anything else for him.