Need Help Identifying some trees - Tree 2

Here is the second tree I cannot identify

Taro

 

Probably (not definitely) Callery Pear Pyrus calleryana.

 

I am not sure if that may be the identification of this tree as it does not produce flowers or berries or seeds or any sort yet and it seems to be plenty to exhibit those if it is supposed to.

Taro

 

Definitely a pear, if not flowering yet probably just a seedling that isn't old enough.

 

Okay, I didn't realize they had to be so huge to produce the fruit as I have two pear trees in the back that regularly produce Pears that the tree is half that size. My mother did make a comment that the tree was probably not producing fruit because another tree was not beside it to cross pollinate, is this true?

Tammy