After writing a post over a week ago, I Googled whose vs. who's. I think I learned something new or relearned something I forgot.
This post does a lovely job of clearing the confusion in my mind of when to use "whose" and when to use "who's." I'm simplifying the difference to this: whose always shows an element of possession.
Hope it helps you, too, although you probably already knew the difference between the two, didn't you?
Smart, grammarian, blog reader - ha!
Jen
