Possessive a) Nouns b) Noun's c) Nouns'

Tomorrow we will have a quiz on possessive nouns. Remember our rules!

If it is singular possessive, there is an apostrophe s at the end (even if it ends in S like Chris's pencil!)
If it is plural possessive, there is just an apostrophe (if it ends in S) and an apostrophe s if the noun does not end in s (like the mice's shoelaces)

Many people (adults included) make mistakes when they use apostrophes.  Many of these mistakes are related to possessive and plural nouns.  There is even a whole website dedicated to finding the mistakes and sharing them with the world!  Check out Apostrophe Abuse.  Here are some pictures that I found on that site.  Can you find the errors?

Here is a link to the game we played in class today.  Comment to this post with a sentence using a possessive noun!