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first of all be done.Thirdly, afterwards, the author takes 60 political news, entertainment news, sports news and sci-techEnglish news reports, collected from the two influential official websites—Los Angeles Times, WashingtonPost, as a corpus to be made in detail. Among different contents of news items, these four types of newsreports have a large number of hits relatively, and the relevant professional terms and expressions areseldom appeared in these four types. So these contents of news are much closer to people’s life and easierto be understood, especially for the younger English learners who are more interested in these four subjects.Due to the limited time and space, not all the types of news reports can be studied in this research, only tomake analysis of some typical types which can be representative samples. If devoted more time and energyto do the research of more types of news reports, the results of the study will be more comprehensive.
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Chapter Two Literature Review

2.1 Related Studies on Thematic Structure
The theme was first proposed by Vitem Mthesius, the founder of the Prague School, a Czechoslavaklinguist in 1939, who defined Theme as “the starting point of utterance which is known or at least obviousin the given situation and from which the speaker precedes.” In the process of communication, theme is thestarting point of the discourse. Generally speaking, it is given information. While rheme is the central partof the discourse, it is new and primary information. Vitem Mthesius declared that a clause should beanalyzed at two levels, one of which is the Formal Division, i.e. to segment a clause into subject, predicate,object and other elements according to grammar, the other is termed the Actual Division, which is used todivide a clause into Theme-Rheme from the functional point of view. In the 1960’s, M.A.K. Hallidayincorporated the Theme-Rheme approach together with other linguistic theories into his SystematicFunctional Grammar (Gou Yajun, 2003)According to Halliday, theme is “the element which serves as the point of departure of the message; itis that with which the clause is concerned” (Halliday 1994: 37). In a word, the theme is the center body of aclause. “The reminder of the message, the part in which the theme is developed, is called in Prague schoolterminology the rheme” (Halliday 1994: 37). Also another expression consistent with Halliday’s statementis that theme is “the idea that is represented by the constituent at the starting point of the clause” (Bloor1997:72). And the rest of the clause is the developed message, which is termed as rheme. So rheme isexpressed as “the rest of the message” (Bloor 1997: 72). That is to say, a clause is expressed as a theme issucceeded by a rheme.
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2.2 Studies on Thematic Progression Patterns
As we all know, the Thematic Progression Patterns (TPP) is a typical structure within a clause,Halliday (2006: 54) points out “thematic organization appearing in different guise throughout the system oflanguage, with manifestations both above the clause and below it”. He also mentions that “Above theclause, the same principle lies behind the organization of paragraph in written discourse; the ‘the topicsentence’ of a paragraph is nothing other than its Theme, and the choice of clausal themes plays afundamental part in the way discourse本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。