While searching for a cartoon referencing (some vs all) I stumbled into this neat online reference and practice website. I can see myself visiting this site quite a bit in my future. I do hope it remains free to utilize.
http://www.grammar-quizzes.com/clauses-6.html
I've bookmarked it to my favorites as I have long ago put those 30 year old textbooks into the library, where they capture dust far better, than they do my attention.