learn+to do sth 还是 doing sth

都有
Learn to do sth 学做某事
Learn Sth 学某样东西

比如
Learn to swim.
Learn to Swimming.

注意....这里的Swimming作为名词而使用

本身 Learn to do 是正确的

不可以Learn+动名词

只有learn to do sth对，学做某事应该是learn to do sth.,或者直接用learn sth.

learn to do

learn to do sth. 学习做某事

TO DO