Как так? Разговорный русский. Speak Russian like a native.

КАК ТАК?🤦 Normally, we don't expect to get the answer when making the question with "как так". First of all, we want to express our attitude towards the situation. As a rule, it's negative, it reflects our regrets and disappointment. ◾ Как так, ты не сдал экзамен? How come you didn't pass the exam? ◾ Как так, тебя уволили? How come you were fired? ◾ Как так, ты опоздал на самолёт? How come you missed the plane? Don't forget that it's used in conversation, it sounds quite informal, so don't use it in written and formal speech. Удачи с русским!