Read these lines that contain a flashback. "i know how it will be," his sister had said when he was preparing to migrate to this rural retreat; "you will bury yourself down there and not speak to a living soul, and your nerves will be worse than ever from moping. i shall just give you letters of introduction to all the people i know there. some of them, as far as i can remember, were quite nice." what effect does the flashback have on the text?