probably. . ^^;

Thank you! So ~았/었어야 is similar to ~ㄹ/을 걸 그랬다, which is translated to "should have" in English?

in my opinion, 가봤어야 알아요 and 어야/아야 ~되다 seem to be similar. In 가봤어야, u can see 봤. it means past tense. So, 가봤어야 알아요 sounds i didn't go there so i don't know. it supposed the opposite situation. Usually 어야/아야 leads the advanced phrases to the result or at least supposed conclusion. ex) 한국말을 알아야 한국인과 말하기가 편해요. ㅡ>it's convenient to talk with koreans when we know korean language. anyway, i hope u understand it even my poor english.