In fourth grade, students are asked to identify the correct usage of apostrophes. While there are many misconceptions about the correct usage, apostrophes are used to show ownership (possession) and to combine two words (contraction). Students should be able to use each correctly, but being able to take it one step further and acknowledge the purpose for each and be able to correctly identify an apostrophe usage as either possession or contraction will help solidify their knowledge about the concept as well as increase their likeliness to use it correctly in their own writing. This brief document can be used as either a pre-assessment to a unit, a review worksheet, or an assessment at the end of a unit. It includes various forms of CPU, including multiple choice, labeling, etc.