I'm one of those people who can spot run-on sentences and comma splices in other people's books and is driven crazy by them, but in my own writing I seem to have them and not notice. When I wrote my completed short story, one of my beta readers found a lot of comma splices and run-on sentences--and that was after my punctuation edits. I think if the sentences reads to me the way I have that scene in my head, I don't notice the punctuation problems. I've never been strong with punctuation, so how do I keep myself from overlooking these things? For odd-ball things like semi-colons and m-dashes I can use the "find" feature and see if they work or can be deleted, but for commas and periods (and lack of) it's a whole lot trickier. One example I run into a lot is not knowing if a comma is necessary or optional, and if it's optional I don't know if I should I put it there or not. In my earlier statement "When I wrote my completed short story, one of my beta readers . . ." I don't know if that comma is necessary or optional. Thank you in advance!