Kids love stories. Tell them stories in the target language, English in our case. You can get them from readers.
Anyway, now with my adult students I make stories up. I give them worksheets with numbered sentences. Each sentence is a short step within the stories. Each sentence is below the previous one.
With your younger students you all can create a story. Provide the first sentence, for instance with a thriller taste. Ask your kids give you more sentences. Write them on the chalkboard. Though they may be childish to you, accept their proposals – their contributions are important to them.
Take advantage to teach conjunctions and prepositions: however, but, so, although, all in all… / Photo from: US Navy On duty in the base air traffic control tower commons wikimedia org