| Abstract | 第1-8页 |
| 摘要 | 第8-11页 |
| Lists of Tables | 第11-12页 |
| Lists of Figures | 第12-13页 |
| Abbreviations | 第13-14页 |
| Chapter One Introduction | 第14-19页 |
| ·Background of This Study | 第14-15页 |
| ·Purpose and Significance of the Research | 第15-17页 |
| ·Organization of the Research | 第17-19页 |
| Chapter Two Literature Review | 第19-42页 |
| ·Tense and Aspect | 第19-30页 |
| ·English and Chinese Temporality Systems | 第23页 |
| ·The Present Perfect and the Present Perfect Variation | 第23-25页 |
| ·Lexical Aspect | 第25-28页 |
| ·Temporal Adverbials | 第28-30页 |
| ·Theoretical Foundations | 第30-34页 |
| ·The Aspect Hypothesis | 第30-31页 |
| ·The Functional Hypothesis | 第31-32页 |
| ·Prototype Theory | 第32-33页 |
| ·Cognitive Principles | 第33-34页 |
| ·Previous Research | 第34-42页 |
| ·Lexical Aspect | 第34-37页 |
| ·Temporal Adverbials | 第37-38页 |
| ·The Present Perfect | 第38-40页 |
| ·Comments on the Previous Studies | 第40-42页 |
| Chapter Three Methodology | 第42-53页 |
| ·Research Questions and Hypotheses | 第42-43页 |
| ·A Brief Introduction to CLEC | 第43-45页 |
| ·Data Collection | 第45-47页 |
| ·Data Coding | 第47-52页 |
| ·Coding the Present Perfect Variations | 第47-48页 |
| ·Coding the Lexical Aspect and Temporal Adverbial | 第48-52页 |
| ·Data Processing | 第52页 |
| ·Data Analysis | 第52-53页 |
| Chapter Four Results and Discussion | 第53-78页 |
| ·Results | 第53-68页 |
| ·Distribution of the Present Perfect Variables in CLEC | 第53-56页 |
| ·The Influences of Lexical Aspect on the Present Perfect Variation | 第56-61页 |
| ·The Influences of Temporal Adverbials on the Present Perfect Variation | 第61-68页 |
| ·Discussion | 第68-78页 |
| ·Distribution of Present Perfect Variation in CLEC | 第68-71页 |
| ·Analysis of Lexical Aspect and the Present Perfect Variation | 第71-73页 |
| ·Analysis of Temporal Adverbials and the Present Perfect Variation | 第73-78页 |
| Chapter 5 Conclusion | 第78-83页 |
| ·Major Findings of the Research | 第78-79页 |
| ·Implications of the Research | 第79-81页 |
| ·Limitations of the Research | 第81页 |
| ·Suggestions for Future Research | 第81-83页 |
| Bibliography | 第83-88页 |
| Appendices | 第88-91页 |
| Appendix Ⅰ | 第88-90页 |
| Appendix Ⅱ | 第90-91页 |
| Articles Published During M.A. Study | 第91-92页 |
| Acknowledgments | 第92页 |
