| Acknowledgements | 第1-5页 |
| Abstract | 第5-7页 |
| 中文摘要 | 第7-9页 |
| Table of Contents | 第9-12页 |
| Chapter One Introduction | 第12-16页 |
| ·Overview | 第12页 |
| ·Need for the study | 第12-13页 |
| ·Significance of the study | 第13-14页 |
| ·Structure of the thesis | 第14-16页 |
| Chapter Two Literature Review | 第16-27页 |
| ·Terms and concepts related to connectives | 第16-18页 |
| ·Classification of causal connectives | 第18-20页 |
| ·Halliday and Hasan's classification | 第18-19页 |
| ·Mo Junhua's classification | 第19-20页 |
| ·Deng Xin's classification | 第20页 |
| ·Classification of causal connectives in the present study | 第20页 |
| ·Theoretical foundation for the study | 第20-21页 |
| ·Halliday's approaches to cohesion | 第20-21页 |
| ·Interlanguage | 第21页 |
| ·Related studies | 第21-26页 |
| ·Studies of causal connectives abroad | 第22-24页 |
| ·Studies of causal connectives at home | 第24-26页 |
| ·Summary | 第26-27页 |
| Chapter Three Methodology | 第27-35页 |
| ·Research questions | 第27-28页 |
| ·Research material | 第28-29页 |
| ·Oral data | 第28页 |
| ·Written data | 第28-29页 |
| ·Data analysis | 第29-34页 |
| ·Data preparation | 第29-30页 |
| ·Data analyzing procedures | 第30-34页 |
| ·Summary | 第34-35页 |
| Chapter Four Results and Discussion | 第35-47页 |
| ·General characteristics of use of causal connectives | 第35-38页 |
| ·Overall frequency of use of causal connectives in both oral and written compositions | 第35-36页 |
| ·Categories of causal connectives and their distribution | 第36-38页 |
| ·The similarities of use of causal connectives in both oral and written compositions | 第38-41页 |
| ·Top 7 causal connectives ranked in oral and written data | 第38-39页 |
| ·Overused and underused causal connectives | 第39-40页 |
| ·Zero-occurrence of causal connectives | 第40-41页 |
| ·Differences in the use of causal connectives by the learners of different levels | 第41-44页 |
| ·Differences in the frequency of use across two proficiency levels | 第41-42页 |
| ·Differences in distribution across two proficiency levels | 第42-44页 |
| ·Relationship between frequency of causal connectives and proficiency | 第44-45页 |
| ·Relationship between frequency and oral proficiency | 第44页 |
| ·Relationship between frequency and writing proficiency | 第44-45页 |
| ·Relationship between variety of causal connectives and proficiency | 第45-46页 |
| ·Relationship between variety and oral proficiency | 第45-46页 |
| ·Relationship between variety and writing proficiency | 第46页 |
| ·Summary | 第46-47页 |
| Chapter Five Conclusion | 第47-52页 |
| ·Major findings of the study | 第47-49页 |
| ·Pedagogical implications | 第49-50页 |
| ·Limitations of this study | 第50-51页 |
| ·Suggestions for future research | 第51-52页 |
| References | 第52-54页 |
| Appendix Ⅰ TEM Band-8 Writing Rubrics | 第54-55页 |
| Appendix Ⅱ Some Selected Cases for the Study | 第55-64页 |
| 攻读学位期间发表的学术论文目录 | 第64-65页 |
