Sorry for taking the thread off topic with yet another diatribe about "grammar verse substance".
When mentoring new writers I feel it is more important to focus on the broad strokes of storytelling rather than the fine points of grammar. Nailing down the point of view is more important than a debate over ending a sentence with a comma or a period.
Yes, I can see the need for minimum standards. I've tried to read stories that were written like long text messages and I can't handle the short hand. I've tried to read stories where the author didn't understand paragraphs and I had to copy, paste, and add paragraphs before I could read them.
So why do I post a "grammar isn't everything" message whenever this subject even tangentially comes up? When I first started posting stories someone asked if English was my first language. It is (and it's my only language) but the first stories I posted had badly mangled grammar and punctuation. Yet without writing those stories and horning my craft over time I would never have reached the point that I'm at now. What I produce fits better into some style guides better than others, but when it comes to grammar I will never be perfect. I accept that while pointing out that since English lack a single authority that administers it (unlike French, which is a codified language) it is impossible to define "perfect" English grammar.
As for my stories, I'm glad that they are part of the library. I cannot foresee ever making a request that they be removed, but they do not (nor will they ever) contain "perfect" grammar. Should the library ever insist on perfection then it would be the library making the decision, not me.
So if I don't think that grammar is all important, what do I think that mentor should get new authors thinking about? Things like point of view.
http://en.wikipedia.org/wiki/Narrative_mode is a good article that list the basics of it, but it doesn't stress how hard it is to master the "alternating person view" or how challenging the "first-person view" is.
Goodgulf