| Acknowledgements | 第4-5页 |
| 摘要 | 第5-7页 |
| Abstract | 第7-8页 |
| Abbreviation | 第12-13页 |
| Chapter One Introduction | 第13-17页 |
| 1.1 Research Background | 第13-14页 |
| 1.2 Research Objectives and Research Questions | 第14页 |
| 1.3 Organization of the Thesis | 第14-17页 |
| Chapter Two Literature Review | 第17-29页 |
| 2.1 Overseas Studies on Null Subjects in Second Language Acquisition | 第17-21页 |
| 2.2 Overseas Studies on the Asymmetry between Null Subjects and Null Objects in Second Language Acquisition | 第21-24页 |
| 2.3 Domestic Studies on Null Subjects and Null Objects in Second Language Acquisition | 第24-27页 |
| 2.4 Summary | 第27-29页 |
| Chapter Three Theoretical Framework | 第29-35页 |
| 3.1 The UG theory | 第29页 |
| 3.2 Access to UG in Second Language Acquisition | 第29-30页 |
| 3.3 Differences on Subjects and Objects between Chinese and English | 第30-34页 |
| 3.3.1 From the Perspective of Pro-drop Parameter | 第30-31页 |
| 3.3.2 From the Perspective of Topic Constructions | 第31-33页 |
| 3.3.3 From the Perspective of Objects | 第33-34页 |
| 3.4 Summary | 第34-35页 |
| Chapter Four Empirical Study | 第35-49页 |
| 4.1 Hypotheses | 第35页 |
| 4.2 Participants | 第35-36页 |
| 4.3 Task | 第36-38页 |
| 4.4 Procedure | 第38页 |
| 4.5 Scoring | 第38-39页 |
| 4.6 Results | 第39-47页 |
| 4.6.1 Difference between the Unlearning of Null Subjects and Null Objects | 第39-40页 |
| 4.6.2 Unlearning of Null Referential Subjects, Null Expletive Subjects and Null Objects in Matrix and Embedded Sentences | 第40-43页 |
| 4.6.3 Unlearning of Null Referential Subjects and Null Expletive Subjects | 第43-45页 |
| 4.6.4 Difference among the Three Groups | 第45-47页 |
| 4.7 Summary | 第47-49页 |
| Chapter Five Discussion | 第49-59页 |
| 5.1 Analysis of Difference between Unlearning of Null Subjects and Null Objects | 第49-52页 |
| 5.2 Analysis of Difference between Unlearning of Null Matrix Arguments and Null Embedded Arguments | 第52-53页 |
| 5.3 Analysis of Difference between Unlearning of Null Referential Subjects and Null Expletive Subjects | 第53-55页 |
| 5.4 Analysis of Difference between Unlearning of Null Expletive Subjects ‘it’ and ‘there’ | 第55-56页 |
| 5.5 Analysis of Difference among the Three Groups | 第56-57页 |
| 5.6 Summary | 第57-59页 |
| Chapter Six Conclusion | 第59-63页 |
| 6.1 Summary of the Major Findings | 第59页 |
| 6.2 Implications | 第59-61页 |
| 6.3 Limitations of the Present Study | 第61-63页 |
| References | 第63-67页 |
| Appendix A | 第67-70页 |
| Appendix B | 第70-73页 |
| 攻读学位期间发表的学术论文目录 | 第73-74页 |
