My Chinese is very poor and perhaps I have not understood your question correctly. I am only a beginner but I would translate them like this: 我不能游泳 I can't swim. So in this case I know how to swim but cannot or must not swim for some reason. If I had a broken leg for example. 我不会游泳 I don't know how to swim. In this sentence you are saying I can't swim but it is because you haven't learnt how to swim. You don't have that skill. In English you could say "I can't swim" in both cases. However, it would depend on context as to whether you were saying you don't know how to swim or you just couldn't swim at that particular moment. Perhaps native Chinese speakers can comment on whether I am correct or not :-)

I can not swim I can not swim This can not and will not be how translation can be shown I am not sure what you mean.