In at least 100 words, explain the author's use of foreshadowing in nadine gordimer's "once upon a time."

Here is an example of foreshadowing in the story. And you can take this and figure out and explain the use of foreshadowing from this excerpt:

Nadine Gordimer weaves many examples of foreshadowing into "Once Upon a Time." The frame story introduces the concept of fear. The idea of the subterranean mining tunnels that rock the narrator's house-dark, invisible, and cryptic-foreshadow the ethnic unrest that rocks the social fabric of the suburban community in the bedtime story.