Why we study rhetoric? B:Grammar maps out the possible;rhetoric narrows down the possible to the desirable and effective. Ex. The middle-class American growing up in the United States feels it is his right to have his own room,or at least using part of a room. Faulty parallel structureWhy we study rhetoric? B: Grammar maps out the possible; rhetoric narrows down the possible to the desirable and effective. Ex. The middle-class American growing up in the United States feels it is his right to have his own room, or at least using part of a room. Faulty parallel structure