The gentlest sheet in the set, and the one to hand over first. Six pictures, each with a sentence missing its pronoun: a boy on a bicycle, a girl watering a plant, two children flying kites, a cat asleep in its bed. The picture supplies the answer, so a child who is still shaky on what a pronoun even is has something to hold on to.
Part B takes the pictures away and does the real work. Maya, Dad and I, the puppy, Ben and Omar are underlined in four sentences and each has to be swapped for the pronoun that stands in for it. That swap is the whole idea of a pronoun, and seeing the name disappear and a shorter word take its place makes the point better than a definition does.