2. A: How long ? (you, be, waiting)
B: I for 30 minutes. (be, waiting)
A: How long have you been waiting? (you, be, waiting)
B: I have been waiting for 30 minutes. (be, waiting)
A: ¾ó¸¶³ª ¿À·§µ¿¾È ±â´Ù¸®°í ÀÖ´Â ÁßÀÌ´Ï?
B: 30ºÐ° ±â´Ù¸®°í ÀÖ¾î.