Apostrophes and how to use them

I've been teaching writing as part of a communication class for a while, and one of the things I notice is the difficulty students have with apostrophes and possessive pronouns. Now, I realize learning the rules for these things can be tedious, but flawless writing is important. I also know that students learn different ways. So here is a nice visual lesson in correct use of apostrophes. Does that make it easier to understand? I'll let you decide whether it's a good explanation of a concept that is often seen in students' work. (Did I get it right the three times I used an apostrophe in that sentence?)

"Learning" by looking at what not to do

I really like correct punctuation. It helps clarify one's meaning, and it shows care in writing. I also love humor. So The "Blog" of "Unnecessary" Quotation Marks is my kind of web site. You can really only get full value from the posts if you read the author's amusing commentary underneath. The bonus value is that if you read a few of these, you'll find it's a pretty painless way to learn how quotations should not be used. Or should I say "painless"?