The sentence is using the word "was" instead of the word "were". Using "were" is appropriate for talking about the past tense for plural things. Simply change the words. Hope this helped :))
Foreshadowing is when an author uses symbolism, an event, a small detail, or even a part of dialogue to be a warning or indication of a future event. An author might use this because they want to give the reader knowledge about a future event or to tease them.
Sensitivity to the sound structure of words
It’s the ability to recognize and work with sounds in a spoken language.