1.没有learn doing sth,一般是learn sth；learn to do sth；learn (sth) from sb；learn to do sth from sb；learn (to do) sth (all) by oneself；learn (to do) sth (all) alone等.
2.不过,在英语中,有些动词的ing形式其实已经等同于名词,所以出现“learn + Ving”也是可以的,如：
learn swimming/skating 学游泳/滑冰
3.但是,楼主要谨记：此类用法只能用于单个的单词,如果是动词短语的话,还是不能用动名词短语形式即doing sth,而只能用不定式to do sth.
如：learn to speak English √；learn speaking English ×
4.另：上述解释中的（ ）表示可以省略.
希望能对你有所帮助!