| Acknowledgements | 第1-6页 |
| Abstract | 第6-7页 |
| 摘要 | 第7-8页 |
| List of Figures and Tables | 第8-12页 |
| Chapter 1 Introduction | 第12-16页 |
| ·Background of the Study | 第12-13页 |
| ·Aims of the Study | 第13-15页 |
| ·Significance of the Study | 第15页 |
| ·Organization of the Paper | 第15-16页 |
| Chapter 2 Literature Review | 第16-36页 |
| ·A Brief Introduction to Parenthesis | 第16-22页 |
| ·Various Definitions of Parenthesis | 第16-17页 |
| ·Different Classifications of Parenthesis | 第17-22页 |
| ·Theory of Pragmatic Analysis | 第22-28页 |
| ·Cohesion | 第22-25页 |
| ·Relevance Theory | 第25-27页 |
| ·Brown and Levinson's Theory of Politeness | 第27-28页 |
| ·Theories of EA and CIA | 第28-33页 |
| ·Error Analysis | 第28-30页 |
| ·The Definition of Error Analysis | 第28-29页 |
| ·The Significance of Error Analysis | 第29页 |
| ·The Source of Errors | 第29-30页 |
| ·Contrastive Interlanguage Analysis | 第30-33页 |
| ·Interlanguage | 第30-31页 |
| ·Contrastive Analysis | 第31-32页 |
| ·Contrastive Interlanguage Anlysis | 第32-33页 |
| ·Previous Studies in This Field | 第33-36页 |
| Chapter 3 Research Methodology | 第36-44页 |
| ·Corpus-Based Studies | 第36-39页 |
| ·Methods for Corpus-Based Studies | 第37-38页 |
| ·Contrastive Interlanguage Analysis Approach in Corpus Study | 第38-39页 |
| ·The Corpora Used in This Research | 第39-41页 |
| ·Wordsmith Tools 4.0 | 第41-42页 |
| ·The Research Process | 第42-43页 |
| ·Research Questions | 第43-44页 |
| Chapter 4 Data Analysis and Discussion | 第44-67页 |
| ·Comparison of Contrastive and Summative Parentheses Between DHCEW and LOCNESS | 第44-50页 |
| ·Higher Frequency in DHCEW | 第48页 |
| ·Lower Frequency in DHCEW | 第48-50页 |
| ·Comparison of Contrastive,Summative and Additive Parentheses Between DHCEW and WECCL | 第50-55页 |
| ·Pragmatic Functions | 第55-63页 |
| ·Cohesive Means | 第55-58页 |
| ·Comparison of Summative Parentheses Used As Elaboration | 第56-57页 |
| ·Comparison of Contrastive and Additive parentheses Used As Extension | 第57-58页 |
| ·Relevance Theory Means | 第58-62页 |
| ·Means of Politeness | 第62-63页 |
| ·Error Analysis of Contrastive,Summative and Additive Parentheses inDHCEW | 第63-67页 |
| ·The Misusing of Contrastive,Summative and Additive Parentheses | 第64-65页 |
| ·Abnormal Low Frequently Used Contrastive,Summative and Additive Parentheses | 第65页 |
| ·Abnormal High Frequently Used Contrastive,Summative and Additive Parentheses | 第65-66页 |
| ·Incomplete Application of Rules | 第66-67页 |
| Chapter 5 Conclusion | 第67-71页 |
| ·Major Findings | 第67-68页 |
| ·Benefits to Contrastive, Summative and Additive Parentheses Study | 第68-69页 |
| ·Implications of the Study | 第69-70页 |
| ·Limitations and Suggestions for Further Studies | 第70-71页 |
| References | 第71-74页 |
| Appendix Ⅰ | 第74-79页 |
| Appendix Ⅱ | 第79页 |
