| 摘要 | 第1-6页 |
| Abstract | 第6-10页 |
| Chapter One Introduction | 第10-18页 |
| ·Aim and Significance | 第10-11页 |
| ·Research Background | 第11-12页 |
| ·Definition of the Key terms | 第12-16页 |
| ·Early Definitions of Discourse Markers | 第12-14页 |
| ·Working-definition in this paper | 第14-16页 |
| ·Data Collection and Research Method | 第16-18页 |
| Chapter Two Literature Review | 第18-29页 |
| ·An Overview of Studies on Discourse Markers | 第18-26页 |
| ·The Discourse-coherence-based Perspective | 第19-20页 |
| ·The Grammatical-pragmatic Perspective | 第20-21页 |
| ·The Cognitive-pragmatic Perspective | 第21-24页 |
| ·The Meta-pragmatic Awareness Perspective | 第24-26页 |
| ·General Remarks on American President Obama’s Speeches | 第26-29页 |
| Chapter Three Theoretical Framework | 第29-36页 |
| ·A General Introduction to Verschuren’s Adaptation Theory | 第29页 |
| ·Key notions: Variability, Negotiability and Adaptability | 第29-32页 |
| ·Four Angles of Investigation | 第32-36页 |
| Chapter Four Discourse Markers in Obama’s Speeches from the Perspective Of Adaptation Theory | 第36-43页 |
| ·Discourse Markers: the Result of Linguistic Choice-making | 第36-37页 |
| ·An Analysis of the Dynamic Adaptability of Discourse Markers | 第37-43页 |
| ·Adaptation to Physical World | 第37-39页 |
| ·Adaptation to Social World | 第39-40页 |
| ·Adaptation to Mental World | 第40-43页 |
| Chapter Five Discourse Markers as Indicators of Meta-pragmatic Awareness in Obama’s Speeches | 第43-50页 |
| ·Discourse Markers as Indicators of Meta-pragmatic Awareness | 第43-44页 |
| ·Functions of Discourse Markers in Obama’s Speeches | 第44-50页 |
| ·Discourse Markers as Indicators of Hesitation and Consideration | 第45页 |
| ·Discourse Markers as Indicators of Coherence | 第45-47页 |
| ·Discourse Markers as Indicators of Reinforcement | 第47-48页 |
| ·Discourse Markers as Indicators of Comment | 第48-50页 |
| Chapter Six Conclusion | 第50-53页 |
| ·Major Findings of the Study | 第50-51页 |
| ·Limitations of the Study | 第51页 |
| ·Suggestions for Further Study | 第51-53页 |
| References | 第53-57页 |
| Acknowledgements | 第57页 |
