| Acknowledgements | 第1-5页 |
| Abstract(English Version) | 第5-7页 |
| Abstract(Chinese Version) | 第7-12页 |
| Chapter One Introduction | 第12-17页 |
| ·Research Background | 第12-14页 |
| ·Significance of the Present Study | 第14-15页 |
| ·Organization of the Thesis | 第15-17页 |
| Chapter Two Literature Review | 第17-32页 |
| ·Definition of Discourse Markers | 第17-20页 |
| ·Classification of Discourse Markers | 第20-21页 |
| ·Classification of Causal Discourse Markers | 第21-26页 |
| ·Halliday & Hasan's Classification | 第22-23页 |
| ·Mo Junhua's Classification | 第23-24页 |
| ·Deng Xin's Classification | 第24-25页 |
| ·Classification of Causal Discourse Markers in the Present Study | 第25-26页 |
| ·Studies of Discourse Markers Abroad | 第26-28页 |
| ·Studies of Discourse Markers at Home | 第28-32页 |
| Chapter Three Theoretical Framework:Relevance Theory | 第32-38页 |
| ·Ostensive-Inferential Communications | 第32-33页 |
| ·The Relevance Principles | 第33-34页 |
| ·Cognitive Environment | 第34-35页 |
| ·The Cognitive Motivation on Using Discourse Markers | 第35-38页 |
| Chapter Four Methodology | 第38-42页 |
| ·Research Questions | 第38页 |
| ·Corpora Used for the Present Study | 第38-39页 |
| ·Procedures for Sampling in the Present Study | 第39-41页 |
| ·Procedures for Data Analysis | 第41-42页 |
| Chapter Five Results and Discussion | 第42-55页 |
| ·Difference of the Frequency | 第42-45页 |
| ·Syntactical Differences of Causal Discourse Markers | 第45-51页 |
| ·Causal Discourse Markers Used in Initial Position | 第46-48页 |
| ·Causal Discourse Markers Used in Unfixed Position | 第48-51页 |
| ·Overused, Underused and Misused Causal Discourse Markers | 第51-55页 |
| ·Overused and Underused Causal Discourse Markers by Chinese EFL learners | 第51-53页 |
| ·Causal Discourse Markers Misused by Chinese Learners | 第53-55页 |
| Chapter Six Conclusion | 第55-59页 |
| ·Major Findings of the Present Study | 第55-56页 |
| ·Implications of the Present Study | 第56-57页 |
| ·Limitations and Suggestions of the Present Study | 第57-59页 |
| Works cited | 第59-62页 |
| Publications | 第62-63页 |
