不是,是做car 的后置定语,现在分词做后置定语,就是运行中的车辆
the car running by=the car which were running by
可以省略which were 这个主谓部分,留下现在分词那如果是被动的定语从句the cat which was caught .which was也可以省略作为定语吗the cat caught 一只被逮住的猫
caught 是过去分词做后置定语