To ask them to sit quietly in a class room for 40 or 50 minutes, to focus their attention for an entire class period, is to press them to do something that is beyond their abilities.
過動兒過動、衝動、注意力不足，要他乖乖在教室裡靜坐四、五十分鐘專心聽完一節課，都是「強人所難」的事。