can could would 的区别can you do.could you do...这两个都没问题,那would you do...可以吗有什么区别吗

can you do（你能做到吗）
could you do(更礼貌点,请做.)
would you do(更礼貌点）
could do和would do的区别在于could do 是讲能不能做到（做事情的能力）
would do 是说会不会去做,想不想（愿意不愿意）
一个是有没有可能性,一个是有可能性但是更有选择