| 摘要 | 第1-6页 |
| Abstract | 第6-10页 |
| Chapter One Introduction | 第10-14页 |
| ·Research object | 第10-11页 |
| ·Rationale of the present study | 第11-12页 |
| ·Objective of the study | 第12页 |
| ·Organization of the thesis | 第12-14页 |
| Chapter Two Literature Review | 第14-21页 |
| ·Introduction to discourse roles | 第14页 |
| ·Overview of the studies on discourse roles in different domains | 第14-18页 |
| ·Research on discourse roles in daily communication | 第15页 |
| ·Research on discourse roles in institutional discourse | 第15-17页 |
| ·Research on discourse roles in literary text | 第17页 |
| ·Evaluation of the previous research on types of discourse roles | 第17-18页 |
| ·Overview of the studies on police discourse | 第18-20页 |
| ·Research on police discourse | 第18-20页 |
| ·Evaluation of the previous research on police discourse | 第20页 |
| ·Summary | 第20-21页 |
| Chapter Three Theoretical Foundations | 第21-30页 |
| ·Speech Act Theory(SAT) | 第21-26页 |
| ·Austin's Speech Act Theory | 第21-22页 |
| ·Searle's development of SAT | 第22-23页 |
| ·Habermas's communicative action theory | 第23-24页 |
| ·Liao's development of SAT | 第24页 |
| ·Mey's pragmatic act theory | 第24-25页 |
| ·Traffic police interview as a pragmatic act | 第25-26页 |
| ·Classifications on discourse roles | 第26-29页 |
| ·Goffman's classification | 第26页 |
| ·Thomas' classification | 第26-27页 |
| ·Evaluation of the above two theories | 第27页 |
| ·Classification of discourse roles in the present study | 第27-29页 |
| ·Summary | 第29-30页 |
| Chapter Four Methodology | 第30-33页 |
| ·Introduction | 第30页 |
| ·Research questions | 第30页 |
| ·Data collection | 第30-31页 |
| ·Data analysis | 第31-33页 |
| Chapter Five General Choice of Discourse Roles in Chinese TrafficPolice Interview | 第33-46页 |
| ·Introduction | 第33页 |
| ·General choice of discourse roles in Chinese traffic police interview | 第33-41页 |
| ·General choice of "Speaker Confirming Message (SCM)" | 第33-36页 |
| ·Discourse role of "SCM" | 第33-35页 |
| ·Linguistic features of "SCM" | 第35-36页 |
| ·General choice of "Speaker Seeking Message (SSM)" | 第36-39页 |
| ·Discourse role of "SSM" | 第36-38页 |
| ·Linguistic features of "SSM" | 第38-39页 |
| ·General choice of "Speaker Transmitting Message (STM)" | 第39-41页 |
| ·Discourse role of "STM" | 第39-40页 |
| ·Linguistic features of "STM" | 第40-41页 |
| ·Motivation for the general choice of discourse roles | 第41-44页 |
| ·Summary | 第44-46页 |
| Chapter Six Switch of Discourse Roles in Chinese Traffic PoliceInterview | 第46-56页 |
| ·Introduction | 第46页 |
| ·Switch of discourse roles in Chinese traffic police interview | 第46-50页 |
| ·Switch between "SCM" and "SSM" | 第46-48页 |
| ·Switch between "SSM" and "STM" | 第48-49页 |
| ·Switch between "SCM" and "STM" | 第49-50页 |
| ·Motivation for switch of discourse roles | 第50-54页 |
| ·Summary | 第54-56页 |
| Chapter Seven Conclusion | 第56-59页 |
| ·Introduction | 第56页 |
| ·Summary of the findings | 第56-57页 |
| ·Theoretical and practical implications | 第57页 |
| ·Theoretical implications | 第57页 |
| ·Practical implications | 第57页 |
| ·Limitations of the present study | 第57-58页 |
| ·Suggestions for future research | 第58-59页 |
| Acknowledgements | 第59-60页 |
| References | 第60-63页 |
| Appendix | 第63-104页 |
