After you and your child finish reading a story together, close the book, and ask, "What do you think happens next?" or "What happens the next day?"
This kind of thinking helps your child in a few ways. It encourages your child to use what she already knows about a character or a situation and run with it—to spin some educated guesses based on that information. That is also called making inferences, a skill she will use in school and in life. But for now, unburdened by finding right answers, she is simply stretching her imagination, and engaging in some storytelling of her own.