Do you know the name of the boy standing at the gate?为什么用standing
问题描述：
Do you know the name of the boy standing at the gate?为什么用standing
答
可以表述为定语从句：Do you know the name of the boy who is standing at the gate!
很明显表示的是状态，所以如果用动词后缀就是standing
答
现在分词作定语,相当于一个定从,表示主动的与正在进行的动作