Give students a daily grade for completing the assignment listed above. I like to take this concept a step farther. I do not test on appositives immediately, but I go ahead and teach a verbals unit: participles, gerunds, and infinitives. Once I have finished teaching verbals, I then assess both the verbals unit as well as appositives.
Throughout the semester, I return to this concept and incorporate a few questions concerning appositives on review packets as a refresher. For many students, this is their first time studying appositives, so I do not want them to forget how they function in sentences.