

경찰이 사고 원인을 조사하고 있어요.
[kjʌŋt͡ɕʰali sako wʌninɯl t͡ɕosaako is͈ʌjo.]
The police are investigating the cause of the accident.
이 문제는 좀 더 조사해 봐야겠어요.
[i munt͡ɕenɯn t͡ɕom tʌ t͡ɕosaɛ pwajakes͈ʌjo.]
I think I need to look into this problem a bit more.
회사에서 고객 만족도를 조사했어요.
[hwesaesʌ kokɛk mant͡ɕokt͈olɯl t͡ɕosaɛs͈ʌjo.]
The company surveyed customer satisfaction.
"조사하다" is in the lesson "Verbs 14" (Level 26), along with 10 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.