Many people will tell you that the raven keeps telling the narrator he will not have what he desires, but I do not believe that is the case. Upon closer investigation, you may notice that the narrator is commanding an answer from the raven, each time saying "tell me". The raven, in turn, tells the narrator "no, I'm not telling you." If you wanted to hear a secret from your friend, and he keeps refusing to tell you, you'd probably get frustrated too.
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