My topic is about paper.

I told about paper.   past, present, future.

      Everybody knows  paper is essential for human begins.
1  past
    Paper is a medium  in the old days.
      people in those days recorded  everything of events on paper.
       But, the upper class only use paper.    paper had been precious.
2   present
    paper isn't precious. Not only the upper class but  everybody use it.
      use a sheet of paper as a note.