STILL Biting

Jasper is still biting, hes not so bad with me and my mom and dad, but if we take him anywhere or if anyone comes to our house, we can say "AH-AH" and "NO" all we want and he ignores us, but he'll stop when hes biting us :mad: and he must understand by now if he stops when hes biting me or my parnets!! And somedays hes really good with the biting, and other days its like we havent spent the past almost 3 weeks telling him no! I have tried every mothod that I was told, but I guess he just has to grow out of it :confused: