the name of the boy standing at the gate算不算介词短语做后置定语?

问题描述:

the name of the boy standing at the gate
算不算介词短语做后置定语?

现在分词短语做后置定语

我认为不算,这是分词短语做后置定语.the book on the desk里,on the desk是book的后置定语,同时它也是介词短语.看出区别来了?