会VS能VS可以
1.“会”means can, and always means to learn a skill,and then can do it.
1) 我以前不会游泳，跟老师学习一个月以后，现在我会游泳了。 I can not swim before, after I study with a teacher for one month, I can swim now.
2) 我不会开车。 I don’t know how to drive. You know in China, citizens can only get the drive license after they are 18 years old.
“能”means be able to. 1) 我喝酒了，所以不能开车。 I drink, so I can’t drive a car.2) 我生病了，今天不能上班。 I’m sick today, so I can’t go to work.
“可以”emphasize permission. After knocking on the door, and then you can say A：我可以进来吗？May I come in? B: 可以。/不可以。Yes,you can./No, you cannot.But this reply is not polite. Chinese always answer “不好意思，请稍等”.That means “ Sorry, wait a moment please.”
You also can check this video:How to differentiate "会", "能" and "可以"？It can answer your question. http://www.hanbridgemandarin.com/course/demo/hui-neng-keyi