One of our spelling units covers adding "ing" to words to show it is happening right now. I did not want my students to confuse this concept with words in the -ing" word family. I created this word sort to practice identifying which words go with each category. These can be cut, mounted on cardstock, and then laminated for use. I plan to use it as a focus/minilesson during my Daily 5 time, but it could also be used as a center activity.