"It" is the<span> stated antecedent. It assumes you know what it is talking about</span>
Kurt Vonnegut's short story "Report on the Barnhouse Effect'' is an example of a postmodernism literature in a way that he used it to spark some interest on self-consciousness and criticism on topics such as history, philosophy, politics and plenty others. However, he used a language that is used by everyday people and one that can relate to many in order to convey postmodernism.
Has Andrea forgotten her umbrella?
Answer:
Primary and secondary sources both contain information regarding what event it was written for. Let's use the Boston Tea Party for example. Someone who was part of the Boston Tea Party could have written about it in a journal as a first person account, and then someone later on could have narrated what happened in a more generic way in a biography.