| 摘要 | 第1-7页 |
| Abstract | 第7-14页 |
| Chapter 1 Introduction | 第14-19页 |
| ·Research background | 第14-16页 |
| ·Objectives of the present study | 第16页 |
| ·Theoretical framework | 第16-18页 |
| ·Organization of the thesis | 第18-19页 |
| Chapter 2 Literature Review | 第19-32页 |
| ·Previous approaches to modality | 第19-22页 |
| ·The view of modality from logical perspective | 第19-20页 |
| ·The view of modality from semantic perspective | 第20页 |
| ·The view of modality from grammatical perspective | 第20-22页 |
| ·About word sense disambiguation | 第22-31页 |
| ·The evolution of word sense disambiguation | 第22-23页 |
| ·Approaches for word sense disambiguation | 第23-27页 |
| ·Word sense disambiguation studies abroad | 第27-29页 |
| ·Word sense disambiguation studies in China | 第29-31页 |
| ·Summary | 第31-32页 |
| Chapter 3 Theoretical Foundation and Methodology | 第32-41页 |
| ·Theoretical foundation of the current study | 第32-39页 |
| ·Connectionism | 第32-34页 |
| ·Artificial neural networks | 第34-39页 |
| ·Research method and data collection | 第39-40页 |
| ·Summary | 第40-41页 |
| Chapter 4 Semantic Categorization of English Modal Verbs | 第41-50页 |
| ·Evolution of the study on modal verbs | 第41-46页 |
| ·Why MUST? | 第46-47页 |
| ·Categorization of the meanings of English modal verb MUST | 第47-49页 |
| ·Root meaning | 第47-48页 |
| ·Epistemic meaning | 第48-49页 |
| ·Summary | 第49-50页 |
| Chapter 5 Construction of Word Sense Disambiguation Model | 第50-72页 |
| ·General description of construction of WSD model | 第50-51页 |
| ·Construction of two sense –tagged corpora of MUST | 第51-53页 |
| ·Feature representation | 第53-56页 |
| ·The construction of the BP network model for MUST | 第56-70页 |
| ·Back propagation network | 第56-58页 |
| ·Determination of the input vectors | 第58-61页 |
| ·The construction of the neural network model | 第61-70页 |
| ·Summary | 第70-72页 |
| Chapter 6 Determination of Contributions of Different Linguistic Features to the WSD of the English Modal Verb MUST | 第72-84页 |
| ·The description of the six experiments | 第72-79页 |
| ·Analysis and discussion | 第79-83页 |
| ·Summary | 第83-84页 |
| Chapter 7 Conclusion | 第84-87页 |
| References | 第87-93页 |
| Appendix I | 第93-95页 |
| Appendix II | 第95-97页 |
| Appendix III | 第97-121页 |
| Acknowledgements | 第121-122页 |
| 作者简介 | 第122页 |
