Practice punctuating sentences with commas with this series of worksheets! At first glance this resource looks to be one learning exercise about using commas in a series. However, you can click "different words" to get a different learning exercise. Also, if you click "next learning exercise," the resource provides you with a different type of activity in which learners must fill in commas in a short letter. An answer key for each exercise, and every word combination of each exercise, is available.