Here is one of those things that I have simply never thought about until recently.
I have a friend who speaks English as a second language and so still has a few overhanging errors in his speech; One of these is to use 'potential' as follows:
He is very potential.
When I corrected this for him, I told him that in that case we would use potential as a noun, "he has a lot of potential", for example.
However, confusion then ensued as we both know that potential is also an adjective, but as far as I am aware, can only be used as a pre-modifier: potential client, potential success, etc.
Is this a unique case? Is there a reason for it?
Am I wrong?