hello
안녕
an young. -informal- (used to those who are younger than you or at your age.)
안녕하세요
an young ha sae yo. -formal-(used towards elderly to show respect)
goodbye
안녕
an young -informal-
/if the older person is leaving you, you say:
인녕히가세요.
an young hee ga sae yo
/if you are the one leaving, you say:
인녕히게세요
an young hee gae sae yo.
sorry
미안
mee an. (playful sorry) -informal-
미안해
mee an hae -informal-
미안해요
mee ann hae you -formal-
thank you
고마워
go ma wo. -informal-
고마워요
go ma wo yo. -formal-
감사함니다
gam sa hap nee dah -more formal and commonly used by Koreans-