"I learn Korean."
Translation:저는 한국어를 배웁니다.
(someone else correct me if I made any mistake)
Formality :) I'm not an expert at all but I think...
배웁니다 (most formal) which just translates to the verb "To learn"
배우십시오 (polite) which translates to "(Please) learn" - Please is implied
배워요 (casual/informal) which translates to "Do learn" but you wouldn't want to respond like this to your CEO boss :) You would use this form with your friends or family members :D
That's as far as my knowledge gets... I might be wrong... Sorry :3