Hangul

안녕 = An nyiong = hello, informal
안녕하세요 = An nyiong ha seh yo = hello, formal
여보세요 = ya bo seh yo = hello on a telephone

예/네 = yeh/neh = yes/yeh
아니요 = ah-nee-yo = no

사랑해요 = saranghaeyo = I love you (parents/grandparents)
사랑해 = saranghae = I love you (informal; intimate gf/bf)

엄마 = um-ma = mom
아빠 = ah-pah = dad
언니 = unni = older sister/close older female (for a girl)
누나 = noona = older sister/close older female (for a boy)
오빠 = oppa = older brother/close older male (for a girl)
형 = hyung = older brother/close older male (for a boy)

source: http://www.wikihow.com/Say-Words-in-Korean

nah-neng dodoke - I am smart
naw-neng paboh - you are stupid
nah-neng gki-yo-woh - I am cute
naw-neng mou-t-sang kio-soh - you are ugly

sa-gua - apple