... speakers of all the language communities) to understand the environment, to act on the others in it, and also to interpret the relevance of the first two purposes interims of the topics under ... 80 , showing the problems of theme selection (including kinds of predicator theme, adjunct theme, subject theme, non - wh theme, wh. theme, etc); theme more clearly expressed in the use of ... in their treatment of clause as message (chapter three) with the careful presentation of the thematic structure, particularly of the English language, detailed in the figure 3-1 2, page 80 ,...