| 摘要 | 第1-8页 |
| Abstract | 第8-13页 |
| Introduction | 第13-17页 |
| 1 Motivation and Significance of the Present Study | 第13-14页 |
| 2 Rationale of the Thesis | 第14-16页 |
| 3 Organization of the Thesis | 第16-17页 |
| Chapter 1 Modality | 第17-26页 |
| ·The Definition of Modality | 第17-18页 |
| ·Types of Modality | 第18-26页 |
| ·Some Earlier Proposals | 第18-21页 |
| ·Classification Approved at Present (from Dichotomy to Trichotomy ) | 第21-26页 |
| Chapter 2 English Modals | 第26-36页 |
| ·Modality and English Modals | 第26-27页 |
| ·Characteristics of English Modals | 第27-29页 |
| ·Meanings of English Modals | 第29-36页 |
| ·Epistemic Meanings of English Modals | 第29-32页 |
| ·Root Meanings of English Modals | 第32-36页 |
| Chapter 3 Previous Approaches to English Modals | 第36-52页 |
| ·The Polysemy View and Its Limitations | 第37-42页 |
| ·The Polysemy View | 第37-39页 |
| ·Limitations of the Polysemy View | 第39-42页 |
| ·The Monosemy View and Its Limitations | 第42-46页 |
| ·The Monosemy View | 第42-45页 |
| ·Limitations of the Monosemy View | 第45-46页 |
| ·The Fuzzy-set Model and Its Limitations | 第46-52页 |
| ·The Fuzzy-set Model | 第46-51页 |
| ·Limitations of the Fuzzy-set Model | 第51-52页 |
| Chapter 4 Cognitive Analysis of English Modals | 第52-83页 |
| ·General Introduction to Cognitive Linguistics | 第53-57页 |
| ·The Philosophical Basis of Cognitive Linguistics | 第54-56页 |
| ·Three Representative Approaches | 第56-57页 |
| ·Cognitive Analysis of English Modals | 第57-83页 |
| ·Tamly’s Force Schemas and Sweetser’s Metaphorical Extension | 第58-67页 |
| ·Langacker’s Evolutionary “Momentum”and Dynamic Evolutionary Model | 第67-83页 |
| Chapter 5 Application of Dynamic Evolutionary Model to English Modals | 第83-90页 |
| ·Two Components of Dynamic Evolutionary Model | 第83-84页 |
| ·Application of Dynamic Evolutionary Model to English Modals | 第84-88页 |
| ·Unsolved Problems | 第88-90页 |
| Conclusion | 第90-94页 |
| Bibliography | 第94-97页 |
| Acknowledgements | 第97-98页 |
| Appendix （攻读学位期间发表论文目录） | 第98-99页 |
| 详细摘要 | 第99-115页 |
