warn sb to do sth warn doing 区别

和remember to do/doing是一个道理。
remember to do是记得要去做某事（这件事还没做）
remember doing是记得做过的某事（这件事做完了）
warn to do是警告别去做某事（还没做）
warn doing警告别再去做（做完了）本回答被提问者和网友采纳

warn sb not to do sth 警告某人不做某事; 提醒警告某人不要做某事;
warn sb. not to do sth.=warn sb. against doing sth. 警告某人别做某事;
warn sb about doing 警告某人不要做某事;

warn sb to do sth
The North Korea is warning the USA not to approach its waters.
朝鲜警告美国不要靠近朝鲜领海。
warn doing
The North Korea has warned carring out nuclear test.
朝鲜警告要核试验。