1.@ fall over 朝某方向 占据某位置
Example：A shadow fell over the room.有个影子映在墙上.
2.@ fall over sb/sth 在行走时...脚碰到某人或某物而大趔趄或跌倒
Example ：he was fell over the bench.他碰到了凳子,打了一个趔趄.
3.@ fall over oneself 动作笨拙
4.@ fall over oneself to do sth 想法设法做某事或获取某物 .