Do you know the boy lying under the big tree?为什么是定语?

问题描述:

Do you know the boy lying under the big tree?为什么是定语?

你认识躺在大树底下的那个男孩吗?
I know the boy lying under the big tree
I(主语)
know(谓)
the boy (宾)
lying under the big tree现在分词做后置定语.
看我的翻译就知道是定语了.