When I first joined this place, I was already a pedant, even if I wasn't a writer. Actually, being precise about it, perhaps I was a technical writer. I did translations, as British English was my mother tongue, while I hadn't lived in an English speaking county for twenty-five years.
I started doing critiques, specialising in grammar and punctuation, spelling and technical verisimilitude. I marked mistakes in red, and a number of my productions came out looking as if they'd been infected by a serious rash. People disliked being told their control of the language was insufficient - I'm not actually sure whether they had been expecting "Oh, that's marvellous", or expected us to write the stories for them - and, even if I'm not the nicest of people I consider squashing ambition and creativity to be avoided, and stopped critiquing, but had already improved the punctuation on the site considerably.
But if you desire basic grammatical analysis of something I am here, mouldering in my retirement flat, with time on my hands. All right, my sister (who went into teaching, like the majority of my family, and even gave a 'creative writing' course for a while, would doubtless be better - but she's not into speculative fiction (what use is fiction that doesn't speculate? I suppose 'what use fiction?' is a futile question). So Chrons got me - a technically educated sound engineer, with no letters involved in his formal training (and you know how letters majors consider us semi-illiterate techies).
I'm old, my pedantry extends to things that are nowadays quite accepted (like split infinitives and comma splices), invariably use subjunctive mood in general conversation - an old fogie - but I have free time, and would be quite happy to give grammatical analyses to anything communicated to be by thick-skinned potential authors - probably not novel length, I'm a bit slow - major works might take me a while.