Call me a snob, but I'm always astonished when I hear educated people say, "Me and so-and-so..." or "It's Mary and I's..."
I'm sorry to sound harsh, but this is not a difficult English concept to grasp, and it's a glaring mistake to make. If you think you might be making it, we can help: 5 Quick English Grammar Tips.
Do you have a grammar issue you'd like us to cover? Leave a comment.