ໃຜກັບໄປຈຳປາສັກ (phai kap pai Champassak )Who left for Champassak?Literally: Who [interrogative] + leave for (v) + Champassak.
Why? ເປັນຈັ່ງໃດ (pen changdai ) The phrase by itself can also mean What's wrong?, but can also ask why or for what reason a condition is occurring.