Grammar police: What's the difference between it's and its, and when is an apostrophe used? What knowledge is almost always a part of a standardized test in English? Do you disagree with the 2009 decision in Great Britain to eliminate apostrophes in street signs ? Did you see an apostrophe error on a company proposal? Is your English teacher lecturing you about when to add an apostrophe to the words ITS? You might give a package of these note cards as an end-of-semester gift (and earn possible brownie points for the report card.) Or are you a person that has noticed the proliferation of IT-apostrophe-S mistakes? What about all those apostrophes added before the letters S on simple plurals? Write your letters to the editor on these cards. Change the world one apostrophe at a time.