| Acknowledgments | 第1-5页 |
| 摘要 | 第5-7页 |
| Abstract | 第7-9页 |
| Contents | 第9-11页 |
| List of Tables | 第11-12页 |
| Chapter One Introduction | 第12-16页 |
| ·Research Background | 第12-13页 |
| ·Research Purpose of the Study | 第13-14页 |
| ·Research Questions of the Study | 第14页 |
| ·The Structure of the Thesis | 第14-16页 |
| Chapter Two Literature Review | 第16-22页 |
| ·SLA Studies on Acquiring English Null Subjects at Abroad | 第16-19页 |
| ·SLA Studies on Acquiring English Null Subjects at Home | 第19-22页 |
| Chapter Three Theoretical Framework | 第22-32页 |
| ·Universal Grammar | 第22-23页 |
| ·Principle and Parameter | 第22-23页 |
| ·The pro-drop Parameter | 第23页 |
| ·Access to UG in Second Language Acquisition | 第23-25页 |
| ·Differences on Subjects between Chinese and English | 第25-29页 |
| ·Obligatory Overt Subjects in English vs. Optional Overt Subjects in Chinese | 第25页 |
| ·Lack of Expletive Subjects in Chinese vs. Expletive Subjects in English | 第25-27页 |
| ·Subject-prominence in English vs. Topic-prominence in Chinese | 第27-29页 |
| ·The Subset Principle and Acquisition of English by Chinese learners | 第29-30页 |
| ·Summary | 第30-32页 |
| Chapter Four Methodology | 第32-37页 |
| ·Research Hypotheses | 第32-33页 |
| ·Subjects | 第33-34页 |
| ·Instruments | 第34-36页 |
| ·Procedures and Data Analysis | 第36-37页 |
| Chapter Five Results and Discussion | 第37-47页 |
| ·Results of Null Subjects in Matrix Sentences vs. Embedded Sentences among Three Groups of Learners | 第37-39页 |
| ·Results of Tests on the Unlearning of Each Type of Null Subjects in English | 第39-43页 |
| ·Results of Tests on the Unlearning of Null Referential Subjects | 第39-40页 |
| ·Results of Tests on the Unlearning of Null Impersonal it | 第40-41页 |
| ·Results of Tests on the Unlearning of Null Anticipatory it | 第41-42页 |
| ·Results of Tests on the Unlearning of Null Expletive there | 第42-43页 |
| ·Result of Null Subjects Relating to Chinese Topic Constructions | 第43-44页 |
| ·Summary | 第44-47页 |
| Chapter Six Conclusion | 第47-50页 |
| ·Major Findings of the Study | 第47-48页 |
| ·Limitations of the Study | 第48页 |
| ·Pedagogical Implication | 第48-50页 |
| Bibliography | 第50-53页 |
| Appendix A | 第53-56页 |
| Appendix B | 第56-60页 |
