Deferential: 저는 피아노를 잘 칩니다.

Polite: 저는 (or 전) 피아노를 잘 쳐요.

Intimate: 나는 (or 난) 피아노 잘 쳐.

Translation: I play the piano well.

저 = formal “I”

나 = informal “I”

는 = topic marking particle

피아노 = piano

을/를 = object marking particle

잘 = well

치디 = to hit, to play by hitting (such as sports)

ㅂ니다  = deferential verb ending

요 = polite verb ending