run不是系动词，是实义动词
例句
1.
After the explosion the street was full of people running for cover.
爆炸发生以后，满街的人都奔跑躲避。
2.
Kids were running this way and that.
孩子们四处奔跑。
3.
She rode off down the road with the dog running behind.
她骑车沿路而去，狗跟在后面奔跑着。
RUN可以作为系动词，比如说设备运行良好：Equipment runs good.
