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the area of extrinsic modality (indicating the involvement of humanjudgment of what is or is not likely to happen) (Quirk, 1985: 137, 219-221).

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2.2 Previous Studies on Modality in China
At the beginning of Chinese grammar, grammarians do not pay special attention tomodality, their research is limited to the main expression of modal meaning. With thedevelopment of domestic grammar and the influence of foreign research on modality, manyscholars at home gradually become interested in modality.Tsang (1981) points out that although modality in Chinese is not so obvious as that inEnglish, it still remains. So he systematically studies the modality in modern Chinese. Hethinks that the modal category is a semantic category, which has its own semantic andsyntactic features that rely on language (Tsang, 1981).Qiu Shude (1995) studies modal verbs from pragmatic perspective. He makes acomparision on modality system between Chinese and English. And he discusses modalmeanings from three opposite aspects: intrinsic modality vs. extrinsic modality, subjectivitymodality vs. objectivity modality and hypothetical meaning vs. factual one. In his paper, healso discusses pragmatic features of modality in discourse (Qiu Shude, 1995: 50-51).Zhang Zhenbang (1997) divides the auxiliaries into three subclasses in his book NewEnglish Grammar. They are the primary auxiliaries (be, have, do), the modal auxiliaries (themodal verbs for shall, can, may, will, must, etc.), the semi-auxiliaries (dare, need, ought to,used to) (Zhang Zhenbang, 1997:410).
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Chapter Three Theoretical Framework.......14
3.1 Halliday’s Classification of Modal Verbs........14
3.2 The Adaptation Theory..........14
3.2.1 The Three Key Points of Adaptation Theory.....15
3.2.2 The Four Aspects of Adaptation Theory..... 17
3.3 Contextual Correlates of Adaptability...... 18
Chapter Four Methodology.......22
4.1 Research Questions........ 22
4.2 Data Collection........ 23
4.3 Software..... 25
4.4 Research Procedures.......25
Chapter Five Results and Discussion.....27
5.1 Distribution of Modal Verbs and Modal Values in Introduction Sections..... 27
5.2 The Contextual Adaptability of Modal Verbs in RA.... 33
5.3 The Adaptation Features of Modal Values in Contextual Adaptability......45

Chapter Five Results and Discussion

In this chapter, the quantitative method will be used to calculate the frequency of eachmodal verb in introduction sections of Education and Engineering academic discourse withthe help of Antconc 3.4.3, and the distribution of modal values will be also presented in thispart. Then the qualitative description about how the nine modal verbs in introduction sectionsof academic discourse reflect contextual adaptability will be described, after that, theadaptation features of modal values in contextual adaptability in introduction sections ofEducation and Engineering articles will be presented in order to find their similarities anddifferences. And how modal values are related to contextual adaptability will also beinvestigated in this part.

5.1 Distribution of Modal Verbs and Modal Values in IntroductionSections
This part is related to quantitative research results. With the help of Antconc 3.4.3, theoccurrences and frequencies of nine modal verbs and thre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。