Final answer:
The frame story in Chesnutt's 'The Goophered Grapevine' adds background information and context, highlighting the themes of race, power, and deception.
Step-by-step explanation:
In Chesnutt's 'The Goophered Grapevine,' the frame story adds to our understanding of the main story's message by providing background information and context. The frame story is set at a modern-day vineyard where the narrator meets an old man who tells him the story of the goophered grapevine. This frame story helps to highlight the themes of race, power, and deception in the main story.