| 摘要 | 第4-5页 |
| Abstract | 第5-6页 |
| Contents | 第7-9页 |
| List of Tables and Figures | 第9-11页 |
| List of Abbreviations | 第11-12页 |
| Chapter One Introduction | 第12-17页 |
| 1.1 Research background | 第12-15页 |
| 1.2 The purpose of the study | 第15页 |
| 1.3 Signiifcance of the study | 第15页 |
| 1.4 Organization of the thesis | 第15-17页 |
| Chapter Two Literature Review | 第17-40页 |
| 2.1 Theoretical lssues | 第17-22页 |
| 2.1.1 Definitions of Major Terms | 第17-19页 |
| 2.1.1.1 Tense and Aspect | 第17-18页 |
| 2.1.1.2 Grammatical Aspect & Lexical Aspect | 第18-19页 |
| 2.1.2 Related Theories | 第19-22页 |
| 2.1.2.1 Aspect Hypothesis | 第20页 |
| 2.1.2.2 Verb Saliency Hypothesis | 第20-22页 |
| 2.2 Previous Empirical Studies on Acquisition of English Present Perfect Tense | 第22-40页 |
| 2.2.1 Previous Studies in China | 第22-31页 |
| 2.2.2 Previous studies abroad | 第31-38页 |
| 2.2.3 Summary | 第38-40页 |
| Chapter Three Research Design | 第40-45页 |
| 3.1 Research Questions | 第40页 |
| 3.2 Research Subjects | 第40-41页 |
| 3.3 Research Data | 第41-42页 |
| 3.4 Data Processing and Analysis | 第42-45页 |
| Chapter Four Results and Discussion | 第45-64页 |
| 4.1 Verb saliency and English present perfect tense markings | 第45-53页 |
| 4.1.1 Distribution of English present perfect tense markings by verb saliency | 第45-48页 |
| 4.1.2 Effects of verb saliency on English present perfect tense markings | 第48-51页 |
| 4.1.3 Summary | 第51-53页 |
| 4.2 Lexical aspect and English present perfect tense use | 第53-64页 |
| 4.2.1 Distrbution of English present perfect variations by lexical aspect | 第53-56页 |
| 4.2.2 Effects of lexical aspect on English present perfect tense variations | 第56-61页 |
| 4.2.3 Summary | 第61-64页 |
| Chapter Five Conclusion | 第64-71页 |
| 5.1 Major findings of the research | 第64-67页 |
| 5.1.1 The effects of verb saliency on English present perfect tense markings | 第64-65页 |
| 5.1.2 The effects of lexical aspect on English present perfect tense variations | 第65-66页 |
| 5.1.3 The association between verb saliency and proficiency level,between lexical aspect and proficiency level | 第66-67页 |
| 5.2 Implications for language teaching and learning | 第67-69页 |
| 5.2.1 Theoretical implications | 第67-68页 |
| 5.2.2 Pedagogical implications | 第68-69页 |
| 5.3 Limitations of the research and suggestions for further research | 第69-71页 |
| 5.3.1 Limitations of the research | 第69页 |
| 5.3.2 Suggestions for further research | 第69-71页 |
| References | 第71-75页 |
| Acknowledgments | 第75-76页 |
| 攻读硕士期间研究成果 | 第76页 |
