| Acknowledgements | 第1-6页 |
| Abstract in English | 第6-8页 |
| Abstract in Chinese | 第8-15页 |
| Chapter 1 Introduction | 第15-20页 |
| ·Background of the Study | 第15-16页 |
| ·Significance of the Study | 第16-18页 |
| ·Organization of the Thesis | 第18-20页 |
| Chapter 2 Literature Review | 第20-42页 |
| ·Systemic-Functional Grammar | 第20-22页 |
| ·Interpersonal Meaning | 第22-23页 |
| ·Modality System | 第23-31页 |
| ·Types of Modality | 第25-26页 |
| ·Modality Expression | 第26-28页 |
| ·Orientation of Modality | 第28-29页 |
| ·Values of Modality | 第29-31页 |
| ·Tenor of Discourse | 第31-36页 |
| ·The Origin of Tenor | 第32-33页 |
| ·The Classification of Tenor | 第33-36页 |
| ·Studies on Tenor at Home and Abroad | 第36-40页 |
| ·Previous Studies Abroad | 第37-38页 |
| ·Previous Studies at Home | 第38-40页 |
| ·The Relationship between Modality and Tenor | 第40-42页 |
| Chapter 3 Methodology | 第42-50页 |
| ·Research Questions | 第42-43页 |
| ·Data Collection | 第43-47页 |
| ·Corpus Establishment | 第43-44页 |
| ·Data Annotation | 第44-47页 |
| ·Data Presentation | 第47-50页 |
| Chapter 4 A Study of Tenor in Interviews with Barack Obama | 第50-77页 |
| ·An Overview of Tenor in Interviews with Barack Obama | 第50-52页 |
| ·The Realization of Social Tenor in Obama’s Interviews | 第52-61页 |
| ·The Realization in Terms of Modality Expression | 第52-56页 |
| ·The Realization in Terms of Modality Value | 第56-61页 |
| ·The Realization of Interactive tenor in Obama’s Interviews | 第61-74页 |
| ·The Realization in Terms of Types of Modality | 第62-67页 |
| ·The Realization in Terms of Modality Orientation | 第67-74页 |
| ·Reasons for the Differences between Social Tenor and Interactive tenorRealization through Modality | 第74-77页 |
| Chapter 5 Conclusion | 第77-81页 |
| ·Major Research Findings | 第77-79页 |
| ·Limitations and Suggestions for Further Study | 第79-81页 |
| References | 第81-85页 |
| Appendix A | 第85页 |
