أعط أجوبة - English

صوّت الآنتم الإجـابة عليهسؤال لغوي بمعني (سؤال في اللغه المقصوده)
hey guys, can you say me which is correct:do you understand what he is talking ABOUT? or do you understand what ABOUT he is talking?!

ey guys, can you say me witch is correct