| 摘要 | 第5-6页 |
| Abstract | 第6-7页 |
| Contents | 第8-11页 |
| Abbreviations | 第11-12页 |
| List of Tables | 第12-13页 |
| List of Figures | 第13-14页 |
| Chapter 1 Introduction | 第14-20页 |
| 1.1 Research background | 第14-16页 |
| 1.2 Objectives of the present study | 第16页 |
| 1.3 Rationale | 第16-18页 |
| 1.4 Structure of this thesis | 第18-20页 |
| Chapter 2 Literature Review | 第20-31页 |
| 2.1 Studies on word sense disambiguation | 第20-24页 |
| 2.1.1 A brief introduction to WSD | 第20-21页 |
| 2.1.2 Studies of WSD abroad | 第21-23页 |
| 2.1.3 Studies of WSD in China | 第23-24页 |
| 2.2 Studies on the application of formal concept analysis | 第24-27页 |
| 2.3 Studies on modality | 第27-30页 |
| 2.3.1 Studies on modality abroad | 第27-29页 |
| 2.3.2 Studies on modality at home | 第29-30页 |
| 2.4 Previous studies on attribute features of modal verbs | 第30页 |
| 2.5 Space for the present study | 第30-31页 |
| Chapter 3 Methodology and Data Collection | 第31-39页 |
| 3.1 Research procedures | 第31-33页 |
| 3.2 Research methods | 第33-35页 |
| 3.2.1 Corpus-based approach | 第33-34页 |
| 3.2.2 Formal concept analysis method | 第34页 |
| 3.2.3 Nearest neighbor pattern classification method | 第34-35页 |
| 3.3 Softwares used in the study | 第35-36页 |
| 3.4 Data collection | 第36-38页 |
| 3.5 Summary | 第38-39页 |
| Chapter 4 Word Sense Classification of Secondary English Modal Verb Could | 第39-46页 |
| 4.1 Sense classifications of could | 第39-43页 |
| 4.1.1 Root sense | 第40-43页 |
| 4.1.2 Epistemic sense | 第43页 |
| 4.2 Why is could | 第43-44页 |
| 4.3 Operating theory of formal concept analysis | 第44-45页 |
| 4.4 Summary | 第45-46页 |
| Chapter 5 Construction of WSD Model of Could based on FCA | 第46-69页 |
| 5.1 General description of word sense disambiguation procedures | 第46-47页 |
| 5.2 Establishment of training and testing sets | 第47-48页 |
| 5.3 Calculation of mutual information | 第48-50页 |
| 5.4 Addition of syntactic features | 第50-51页 |
| 5.5 Generation of formal context | 第51-55页 |
| 5.6 Word sense disambiguation of the secondary English modal verb could | 第55-57页 |
| 5.7 Rule extraction based on SPOAD | 第57-68页 |
| 5.8 Summary | 第68-69页 |
| Chapter 6 Rule Extraction by the Analysis of Attribute Features | 第69-86页 |
| 6.1 Introduction to attribute features | 第69-70页 |
| 6.2 Analysis of attribute features of could | 第70-79页 |
| 6.3 A comparison between two approaches of rule extraction | 第79-83页 |
| 6.4 Further experiments on the two groups of rules | 第83-84页 |
| 6.5 Summary | 第84-86页 |
| Chapter 7 Conclusion | 第86-90页 |
| 7.1 Main findings | 第86-87页 |
| 7.2 Implications | 第87-88页 |
| 7.3 Limitations of the current research | 第88页 |
| 7.4 Suggestions for the further study | 第88-90页 |
| References | 第90-94页 |
| Appendix Ⅰ | 第94-101页 |
| Appendix Ⅱ | 第101-108页 |
| Appendix Ⅲ | 第108-109页 |
| Appendix Ⅳ | 第109-110页 |
| Acknowledgements | 第110-111页 |
| 作者简介 | 第111页 |
