answer: #Person1# shows #Person2# the books #Person1# is selling and advises #Person2# to buy some, which can save some money. #Person2# buys the English book and the novel. #Person2# finds #Person1# also has books about marital relations and cooking. #Person2# thinks if #Person2# get the picture, #Person2#'s Mom will be excited about that.
documents: #Person1#: Hey, Sis. Are you interested in buying some used books for school? You can really save some money that way.
  #Person2#: Well, what do you have?
  #Person1#: Well, let's see. I have a science book called, Today's World, and I'm selling it for thirty dollars.
  #Person2#: Thirty? That's a little expensive for a beat-up book like that.
  #Person1#: Maybe so, but I bought it for sixty. Plus, I wrote a lot of notes in the book that should help you with the class ... if you could read my writing.
  #Person2#: What else are you selling?
  #Person1#: Okay, I have English writing textbook for fourteen dollars, a math book for twenty-three, and a novel for only seven bucks.
  #Person2#: Uh, Hmmm.
  #Person1#: It's up to you. You know, these things go fast. I mean you have to listen to my advice as your older brother.
  #Person2#: Psh. I'll take the English book and the novel. I need both of those for sure. I think I'll hold off on buying other books for now. [Okay.] Teachers are always changing their minds about textbooks. [Alright.] And, what are those books?
  #Person1#: Which ones? Ah, ah, nothing. Never mind.
  #Person2#: Wait, wait, wait. Finding Your Perfect Someone. You're selling it for forty dollars? What's, what's this all about? And the price?
  #Person1#: Well. You .. It's a ... It's just a marital relations class. You know about finding a partner. You know, mom's always, you know, on me about that. What does it matter to you anyway?
  #Person2#: Forty dollars? That's a little expense.
  #Person1#: Well, they guarantee results, but ah, never mind. You would never understand.
  #Person2#: What about this one? Introduction to Gourmet Cooking? Why did you take this class? You hate cooking.
  #Person1#: Well, um, I have a friend who's into cooking, and she's [She?] ... I mean, my friend's taking the class. I mean, ugh, does it really matter?
  #Person2#: A marriage class ... a close female friend ... a cooking textbook ... I think I get the picture. Mom's going to be excited about this.
  #Person1#: Ah, you got it all wrong. So, do you want to buy any of these textbooks or not?