

오전에는 수업이 있어요.
[ot͡ɕʌnenɯn suʌpi is͈ʌjo.]
I have class in the morning.
내일 오전 열 시에 만나요.
[nɛil ot͡ɕʌn jʌl sie mannajo.]
Let's meet at ten a.m. tomorrow.
오전에 시간 괜찮아요?
[ot͡ɕʌne sikan kwɛnt͡ɕʰanajo?]
Are you free in the morning?
"오전" is in the lesson "Time 3" (Level 40), along with 13 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.