

머리가 아픈 이유를 모르겠어요.
[mʌlika apʰɯn ijulɯl molɯkes͈ʌjo.]
I don't know the reason I have a headache.
어제 늦은 이유가 뭐예요?
[ʌt͡ɕe nɯt͡ɕɯn ijuka mwʌjejo?]
What's the reason you were late yesterday?
이 노래를 좋아하는 이유가 있어요.
[i nolɛlɯl t͡ɕoahanɯn ijuka is͈ʌjo.]
There's a reason I like this song.
"이유" is in the lesson "Head" (Level 44), along with 11 other useful words. LinDuo has 180 topic lessons like this one, 2,380 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.