unique types of prominence in that after first appearing in the discourse, they are expected to appear again. For example, if an author states the theme and purpose of an essay by means of an introductory sentence, the reader expects the rest of the discourse to be about that theme. Consequently, subsequent appearances of thematic elements are often reduced to unmarked forms such as pronouns. M.A.K. Halliday’s discussion of THEMATIZATION and INFORMATION STRUCTURE—influenced partly by the Prague School
Page 78