They kinda don't know they are ready till they do a wee on the potty/loo. So until he actually does it he will continue to have accidents. But you know what... thats ok Its all part of learning how his body functions. Have you thought of doing a potty party? We did this with Paris, and spent a day on the potty/toilet and I fed her all her favourite special drinks milkshakes, cordial etc to get her to stay there, we ready books and played. I also ran water (not something you could probably do now unless you have plants to water LOL and recycle the water ). Then when she went we blew blow out thingo's and had a big PARTY! We rang daddy, and then "Belle" from beauty and the beast rang to tell her how fantastic she was (a gf ) then after that a smartie every time she did a wee in the potty and then a sticker and eventually she was pretty much self taught. We only ever had one accident after that because mummy had forgot it was time to go!