Final answer:
The sentence that is foreshadowing in the excerpt is Sentence 4, which suggests that Doodle is no longer present in the narrator's life.
Step-by-step explanation:
The sentence that is foreshadowing in the excerpt is Sentence 4. This sentence foreshadows that Doodle is no longer present in the narrator's life. The grinding of the grindstone and the mention of time being ground away suggests that something significant has changed, and the narrator's nostalgic memory of Doodle further hints at a tragic event in their past.
Learn more about foreshadowing in literature