George Eliot uses flashback in Part 1 of Silas Marner. After learning that Marner is a weaver and that he is an outsider in the town of Raveloe, Eliot flashes back 15 years to Marner's time in the town of Lantern Yard. She develops his life there, and how his best friend turned on him. This flashback serves two primary purposes. 1) it gives important expositional information that helps move the plot forward, and 2) it gives psychological insight into Marner's current state. Both of these goals are enhanced by placing the information in a flashback. Knowing what Marner becomes makes the audience feel more deeply when Marner is betrayed.