| Acknowledgements | 第1-3页 |
| Abstract | 第3-9页 |
| CHAPTER 1 INTRODUCTION | 第9-12页 |
| CHAPTER 2 LITERATURE REVIEW AND THEORETICAL FOUNDATION | 第12-33页 |
| ·A brief literature review | 第12-15页 |
| ·Critical Discourse Analysis | 第15-23页 |
| ·Eight principles of CDA | 第17-19页 |
| ·Fairclough's three-dimensional model for CDA | 第19-22页 |
| ·The methodology and procedures of CDA | 第22-23页 |
| ·SFL and CDA | 第23-33页 |
| ·The relationship between CDA and SFL | 第23-25页 |
| ·Modality in Halliday's Functional Grammar | 第25-28页 |
| ·Increasing delicacy | 第28-29页 |
| ·Palmer's Modality System | 第29-33页 |
| CHAPTER 3 FAIRCLOUGH'S THREE-DIMENSIONAL FRAMEWORK UESD IN ANALYZING THE PRESIDENTIAL DEBATE | 第33-43页 |
| ·The division of the debate | 第33-36页 |
| ·The three dimensions of the debate | 第36-43页 |
| ·Social Practice | 第36-38页 |
| ·Discourse Practice | 第38-41页 |
| ·Text analysis: combining SFL with CDA | 第41-43页 |
| CHAPTER 4 HALLIDAY'S MODALITY SYSTEM USED IN ANALYZING THE DEBATE | 第43-52页 |
| ·Interpersonal functions of Modality | 第43-44页 |
| ·Modality in the presidential debate | 第44-48页 |
| ·To provide necessary and favorable information | 第45-48页 |
| ·To prompt action on the part of the public | 第48页 |
| ·The analysis of modal metaphors | 第48-52页 |
| CHAPTER 5 THE DELICATE ANALYSIS OF MODAL VERBS | 第52-71页 |
| ·Brief introduction | 第52-54页 |
| ·The delicate analysis of modal verbs in the debate | 第54-71页 |
| ·The CDA of the debate concerning terrorism | 第55-59页 |
| ·The CDA of the debate concerning Iraq problem | 第59-67页 |
| ·The CDA of the debate concerning North Korean and Iranian problems | 第67-71页 |
| CHAPTER 6 THE ANALYSIS OF OTHER ASPECTS OF MODALITY IN THE DEBATE | 第71-81页 |
| ·The analysis of the choice of pronouns | 第71-74页 |
| ·The choice of content verbs | 第74-78页 |
| ·The choice of tense | 第78-81页 |
| CHAPTER 7 CONCLUSION | 第81-85页 |
| BIBLIOGRAPHY | 第85-87页 |
| APPENDIX | 第87-100页 |
