He found some people (eating) hamburgers in some big cities

He found some people (eating) hamburgers in some big cities in China。为什么要用eating啊?这里的eating显然不是进行时罗。其实很简单,这句话的动词是found,后面当然是跟名词,吃是动词,那怎么办呢?就用动名词,英语中就是这样。意思就是：他发现在中国的一些大城市,人们有吃汉堡包的习惯。