This is a list of common mistakes I see in the work of my high school students. It shows both the correct version and the way it is commonly misspelled or misused. I have students tape this in their interactive notebooks, and I have a laminated poster version hanging in my room. You can use it however it works for you, but I circle these mistakes in all of their writing, and I deduct a point for each one when grading formal writing assignments. It's a quick way to clean up their writing!