| Acknowledgements | 第1-5页 |
| Abstract | 第5-7页 |
| 摘要 | 第7-14页 |
| Chapter 1 Introduction | 第14-18页 |
| ·The Necessity of Causal Connectives in English Writing | 第14-16页 |
| ·The Purpose and Scope of the Present Study | 第16页 |
| ·Overview of the Thesis | 第16-18页 |
| Chapter 2 Literature Review | 第18-27页 |
| ·Research Background | 第18-22页 |
| ·Previous Studies Conducted Abroad | 第18-20页 |
| ·Previous Studies Conducted at Home | 第20-22页 |
| ·Classification of Causal Connectives | 第22-27页 |
| ·Classification by Researchers | 第23-26页 |
| ·Classification in the Present Paper | 第26-27页 |
| Chapter 3 Methodology and Procedure | 第27-34页 |
| ·The Methodology of Corpus-based Study and CIA | 第27-28页 |
| ·Corpora Used in This Study | 第28-30页 |
| ·Data Collection and Processing | 第30-34页 |
| ·Research Tools and Software | 第31页 |
| ·Data Collection and Research Procedure | 第31-34页 |
| Chapter 4 Results and Discussion | 第34-67页 |
| ·General Study of Causal Connectives | 第34-48页 |
| ·The Overall Frequency of Causal Connectives in St3 and BNC | 第34-37页 |
| ·Top Eight Causal Connectives Ranked in St3 and BNC | 第37-38页 |
| ·Comparison of ttr-value of Causal Connectives in St3 and BNC | 第38页 |
| ·The Overused and Underused Causal Connective in St3 | 第38-41页 |
| ·Zero-occurrence of Causal Connectives in St3 | 第41-42页 |
| ·Position of Causal Connectives | 第42-43页 |
| ·Relationship between Chinese EFL Learners' Use of Causal Connectives and English Proficiency | 第43-48页 |
| ·Specific Study of Causal Connectives | 第48-60页 |
| ·The Study of "so" and "because" Used in St3 and BNC | 第48-51页 |
| ·The Study of "so" | 第48-49页 |
| ·The Study of "because" | 第49-50页 |
| ·Comparing "so+becasue" in St3 and in BNC | 第50-51页 |
| ·Frequency and Formality | 第51-55页 |
| ·Comparing Informal "so" and Formal "therefore" "hence" "thus" "thereby" in St3 and BNC | 第52-53页 |
| ·Comparing Informal "because" and Formal "since" "as" "for" in St3 and BNC | 第53-54页 |
| ·Colloquial Tendency in Chinese Students' Writing | 第54-55页 |
| ·Improper Use of Causal Connectives by Chinese EFL Learners in St3 | 第55-60页 |
| ·Preference for Informal Causal Connectives | 第55页 |
| ·Redundant Use of Causal Connectives | 第55-57页 |
| ·Mixed Use of Causal Connectives | 第57-58页 |
| ·Fragment Sentences Introduced by Causal Connectives | 第58页 |
| ·Other Misuses of Causal Connectives | 第58-60页 |
| ·Explanations for Chinese EFL Learners' Use of Causal Connectives | 第60-67页 |
| ·L1 Transfer | 第60-62页 |
| ·L2 Transfer | 第62-64页 |
| ·Input Bias | 第64-65页 |
| ·Chinese EFL Learners' Learning Strategy | 第65-67页 |
| Chapter 5 Conclusion and Implications | 第67-72页 |
| ·Major Findings of the Study | 第67-69页 |
| ·Implications of the Study | 第69-70页 |
| ·Limitations of the Study | 第70-72页 |
| References | 第72-74页 |
| 攻读学位期间的研究成果 | 第74页 |
