Do your students struggle understand POV when there is dialogue? It seems like once you teach them to look for clue words (I, me, my) that automatically think that it is 1st person, even though the character is talking!!
I created two stories. Each story is told from 1st and 3rd POV. Hopefully the side by side layout will help them "see" the difference in 1st and 3rd person point of view.