| Acknowledgements | 第5-6页 |
| 摘要 | 第6-7页 |
| Abstract | 第7页 |
| List of Abbreviations | 第12-13页 |
| Chapter One Introduction | 第13-18页 |
| 1.1 Research Background | 第13-14页 |
| 1.2 Research Purose | 第14-15页 |
| 1.3 Significance of Research | 第15-16页 |
| 1.4 Paper Structure | 第16-18页 |
| Chapter Two Literature Review | 第18-31页 |
| 2.1 English Learner Corpus and L2 Grammar Research | 第18-21页 |
| 2.1.1 Learner Corpus Research | 第18-19页 |
| 2.1.2 L2 Grammar Research Based on Learner Corpus | 第19-21页 |
| 2.2 Dynamic Systems Theory (DST) and Its Application | 第21-24页 |
| 2.3 The Definition and Relevant Conception of Pronoun it | 第24-31页 |
| 2.3.1 Pronoun it | 第24-27页 |
| 2.3.2 The Criterial Feature it | 第27-28页 |
| 2.3.3 Previous Studies on Pronoun it by L2 Learners | 第28-31页 |
| Chapter Three Research Design and Methodology | 第31-40页 |
| 3.1 Pronoun it Usage Categories | 第31-33页 |
| 3.1.1 Referring it | 第31-32页 |
| 3.1.2 Prop it | 第32页 |
| 3.1.3 Anticipatory it | 第32-33页 |
| 3.2 The Corpus | 第33页 |
| 3.3 Procedures of Data Collection | 第33-35页 |
| 3.3.1 Establishment of Data Pool | 第34页 |
| 3.3.2 Data Retrieval | 第34-35页 |
| 3.4 Annotations | 第35-37页 |
| 3.5 Inter-Coder Agreement | 第37-38页 |
| 3.6 Statistical Methods | 第38-40页 |
| Chapter Four Description of Use of Pronoun it in L2 Writing | 第40-71页 |
| 4.1 Overview of Size and Range on the Use of Pronoun it across Different Developmental Stages | 第40-48页 |
| 4.1.1 The Overall Size of the Use of Pronoun it across Different Developmental Stages | 第40-44页 |
| 4.1.2 The Overall Range of the Use of Pronoun it across Different Developmental Stages | 第44-46页 |
| 4.1.3 Discussion of the Overall Development Trends of Pronoun it Use | 第46-48页 |
| 4.2 Group Developmental Trends and Individual Trajectories in the Frequency of Different it Use | 第48-55页 |
| 4.2.1 Referential it (Rit) | 第49-51页 |
| 4.2.2 Prop it (Pit) | 第51-53页 |
| 4.2.3 Anticipatory it (ANTit) | 第53-54页 |
| 4.2.4 A Summary of the Group Developmental Trends and Individual Trajectories | 第54-55页 |
| 4.3 Description of Features of the Use of Pronoun it Using VNC and Correspondence Analysis | 第55-65页 |
| 4.3.1 The Results of Variability-Based Neighbour Clustering (VNC) | 第56-57页 |
| 4.3.2 The Results of Correspondence Analysis | 第57-64页 |
| 4.3.3 Summary of Descriptive Features of the Use of Pronoun it | 第64-65页 |
| 4.4 Confirmatory Results for the Features Determiners of the Pronoun it Use | 第65-71页 |
| Chapter Five Conclusions | 第71-76页 |
| 5.1 Summary of Major Findings | 第71-72页 |
| 5.2 Implications of the Study | 第72-74页 |
| 5.3 Limitations of the Study and Suggestions for Future Studies | 第74-76页 |
| References | 第76-81页 |
| Appendix | 第81页 |
