Final answer:
The sentence that foreshadows Doodle not being present in the narrator's life.
Step-by-step explanation:
The sentence from the excerpt that is foreshadowing is sentence 4. It foreshadows that Doodle is no longer present in the narrator's life. This can be inferred from the line 'But sometimes (like right now), as I sit in the cool, green-draped parlor, the grindstone begins to turn, and time with all its changes is ground away-and I remember Doodle.' The mention of remembering Doodle suggests that he is no longer alive, which is a significant event in the narrator's life.
Learn more about Foreshadowing in literature