Proper adjectives, formed from proper nouns, help us to say something more directly, using a shorter sentence. For example compare the two sentences:

  • The play Romeo and Juliet, which was written by Shakespeare, is showing at the theatre now.
  • The Shakespearian play, Romeo and Juliet, is showing at the theatre now.
  • Or compare these sentences:

  • I watched the president who is currently in office in America make a speech last night.
  • I watched the American president make a speech last night.