I think where I run into trouble is with an old Catholic school english teaching..."when in doubt, remove everything but the subject and the verb...if they don't agree, it's wrong". So, Bill and Ernie make pies for a living. Bill and Ernie MAKE they don't MAKES even though pies is plural. So, I would never say "I were" (going to the store, having a nap, etc). We were, yes. That's why I always thought "was" should be the form used. Of course, now I've read this discussion and my head has exploded. ;)