Forms.....

In class the other day we talked about the world of forms and used trees as an example, saying that our soul has knowledge of the world of forms and uses that knowledge to recognize a tree as a tree. I think that nature exists and that we name a tree as a tree because we need something to call it. It cannot be proven that there is a world of forms or a soul that has complete knowledge of said world. I think that is why people in the world recognize objects with different words, because they don't know all about forms and things. I think we just label objects with a word because we need a way to communicate to each other what we are talking about. A tree is a tree because we have called it such.
Question: what do you think about the world of forms?