And the answer is: There is no definitive answer. Pick your grammar book and pick your answer.
Hah. That's what I've said all along
We've had some fascinating debates about lots of different points of grammar over the years, and it always seems to come down to which book you prefer. My usual caveat is that having picked one, you need to stay consistent with it, but that really doesn't apply here...
PJ
who is glad there are FOLCs who know more about grammar than she does