Ive been teaching listening class for three years. My students are three-year college freshmen. After each class, when I reflex I often feel I didn't monitor their listening well enough, thus I was slow to detect their listeing problem and failed to help them sometimes. I wond if there's any other way of finding out the listening barriers in class other than infering from their answer feedbacks or facial expressions. I have to say, it's no use to ask them "why couldn't you understand? And where?" It's especially difficult when it's an unresponsive class. Can you help me? Any welcome is welcome