| 摘要 | 第1-6页 |
| Abstract | 第6-9页 |
| Chapter One Introduction | 第9-12页 |
| ·Background of the Research | 第9页 |
| ·Objective and Significance of thesis | 第9-11页 |
| ·The Layout of the Thesis | 第11-12页 |
| Chapter Two Literature Review | 第12-30页 |
| ·The Definitions of Discourse Markers | 第12-14页 |
| ·Diversified Definitions of Discourse Markers | 第12-13页 |
| ·Operational Definition of Discourse Markers | 第13-14页 |
| ·Characteristics of Discourse Markers | 第14-15页 |
| ·Relationships between DMs and Communication | 第15-17页 |
| ·So as a Discourse Marker | 第17-19页 |
| ·The Use of So in Longman Dictionary | 第17-19页 |
| ·Studies about Discourse Marker so | 第19页 |
| ·Related Researches of DMs Abroad and at Home | 第19-27页 |
| ·Related Researches of DMs Abroad | 第19-25页 |
| ·Related Researches of DMs at Home | 第25-27页 |
| ·Problems Existing in Previous Research on DMs | 第27-30页 |
| Chapter Three Theoretical Framework | 第30-39页 |
| ·Cognitive context | 第30-33页 |
| ·Dynamic Cooperation | 第33-35页 |
| ·Optimal Relevance | 第35-39页 |
| Chapter Four Methodology | 第39-71页 |
| ·Research Purpose and Research Questions | 第39页 |
| ·Methods | 第39-42页 |
| ·Corpus from Crossover | 第39-40页 |
| ·Instrument | 第40-41页 |
| ·Procedures | 第41-42页 |
| ·Data Collection and Analysis | 第42页 |
| ·Result and Discussion about So among Crossover | 第42-71页 |
| ·Total Frequencies | 第42-43页 |
| ·Non-discourse Marker Functions of so | 第43-49页 |
| ·Adverb of Degree or Manner | 第45页 |
| ·Expressing Purpose or Result | 第45-47页 |
| ·So in Fixed Expressions | 第47-48页 |
| ·So as a Substitute | 第48-49页 |
| ·Discourse Marker Functions of So | 第49-71页 |
| ·So as a Result Marker | 第50-53页 |
| ·So as a Delaying Marker | 第53-55页 |
| ·So as an Inference Marker | 第55-57页 |
| ·So as a Commentary Marker | 第57-60页 |
| ·So as an Initiator Marker | 第60-62页 |
| ·So as a Turn-taking Marker | 第62-65页 |
| ·So as a Conclusion Marker | 第65-68页 |
| ·So as a Transitional Marker | 第68-71页 |
| Chapter Five Conclusion | 第71-76页 |
| ·Major Findings | 第71-73页 |
| ·Implications of the Research | 第73-74页 |
| ·Limitations of the Present Study | 第74-75页 |
| ·Suggestions for Future Research | 第75-76页 |
| References | 第76-80页 |
| Appendix A | 第80-83页 |
| Acknowledgements | 第83-84页 |
