learn的结构是不是有两种,1：learn to do sth;2:learn doing sth

learn+to do sth 还是 doing sth 请问learn to do sth.是否等于learn doing sth. learn to do sth,还是learn doing sth 有learn doing 等于learn to do sth 我想知道 learn to do sth.和learn doing sth 的用法和区别 learn to do sth. 和learn sth. 的区别 learn 用法learn doing sth 这种用法有没有?急用,learn to do sth 和learn do learn to do sth造句 learn to do sth.造句 learn sth from sb Learn to do sth 造句 关于learn的用法learn的用法是learn to do sth,为什么书上还说learn how to do st learn doing sth from sb.的疑问