Ah, that's very helpful info. Thanks!

you use '돼' often when you are not so sure or have no idea about what you are asking. sounds like really relying on the other's opinion. ex) 먹어도 돼요? 선생님! 이제 집에 가도 돼요? 레코드샵 가려면, 이 쪽으로 가야 돼요?

'돼' is shorten one of '되어' '되어' means 'become' and a verb which is used when someone change thier job or something is changed its condition.. ex) '그는 대통령이 되었다.' be became a president' '노랑과 파랑을 함께 섞으면, 초록이 된다' 'mix yello and bule together it will be green' but 'DVD 플레이어 사려면 어디 가야 돼?' is wrong sentence it should be 'DVD 플레이어 사려면 어디 가야 해?' korean used '되세요' too much. so they make a lot of mistake, even some korean don't notice if they are wrong.. people should use '하다' but '되다' ex) when some people want to say 'have a nice day' in korean they use '즐거운 하루 되세요' or '좋은 시간 되세요' thoes are incorrect... it should be "즐거운 하루 보내세요' , '좋은 시간 보내세요' for more example 먹어야 돼(X) 먹어야 해(O) should i eat? 가야 돼?(X) 가야 해?(ㅇ) should I go? 지금 꼭 자야 돼?(X) 지금 꼭 자야 해?(ㅇ) Sould I sleep now? -------------------------------------------------------------- even though many korean don't know this. but i wish you use this correctly