1. with whom did you go?

누구와 함께 갔었니?
2. To whom were you speaking?

누구와 이야기 했어?
3. To which address did you send it?

너는 그것을 어느 주소로 보냈어?
4. On what do you base your theory?

너는 너의 이론을 어느것에 근거를 두니?
5. What(which) students are you talking about?

네가 이야기하고 있는학생들은 누구야?
6. How ever did he escape unhurt?

(* The car was a compelte wreck.)

상처없이 어떻게 피했다는 거야??