I think you may be missing my point. I'll be more frank.

I believe the things you're pointing out are only symptoms of a larger problem, and constantly trying to band-aid it isn't going to get Tara or anyone here anywhere. From what I understand, Tara hasn't ever really finished a project. Combining that with all that I see does show a lack of understanding of fundamentals, but the fact that it has happened over a span of years suggests that addressing him the same way will only continue the cycle.

That's why instead of worrying about the grammar or story altogether, I'm issuing a challenge: Finish the story. I don't care if the final product looks nothing at all like he'd hoped. Complete something, and from there I believe the creative process will forcibly teach him what y'all cannot seem to get through to him. At this point the only teacher will be experience.