Are you asking me to correct the grammar?
Answer:
it foreshadows the murder by letting you know that the narrator is mad.
Explanation:
by letting you know that the narrator is mad.
The primary functions of body paragraphs in a comparative essay on genres are to introduce the broad topic of the essay in the first paragraph and the following body paragraphs will provide smaller, individual supporting details about the main topic. First paragraph can cover the definition and importance of genre and the following body paragraphs can detail types,classification and specific details of each.