좋아 [ joa ] & 좋아요 [ joayo ]
좋아 means ‘I like it’, or ‘good’ and 좋아요 is a polite form of 좋아. They are used as declarative sentences. However, conveniently, they are also used as interrogative sentences with raising the tone at the end.
a) 아이스크림 좋아요? (Would you like ice-cream?) b) 네, 좋아요. (Yes, please.)
a) 기분 좋아? (Do you feel good?) b) 좋아. (Yes.)
a) 영화보자. (Let’s go see a movie.) b) 좋아. (Sure.)
* If you want to be more polite than 좋아요, you can use 좋습니다 [ joseumnida ] for declaratives and 좋습니까 [ joseumnikka ] for interrogatives.