| ACKNOWLEDGEMENTS | 第1-5页 |
| ABSTRACT | 第5-8页 |
| 摘要 | 第8-12页 |
| LIST OF FIGURES | 第12-13页 |
| Chapter One INTRODUCTION | 第13-19页 |
| ·The Motivation and Significance of the Thesis | 第13-17页 |
| ·The Organization of the Thesis | 第17-19页 |
| Chapter Two PREVIOUS STUDY ON THE POLYSEMY OF ENGLISHMODALS | 第19-41页 |
| ·Grammatical Study | 第19-25页 |
| ·Semantic Study | 第25-28页 |
| ·Pragmatic Study | 第28-33页 |
| ·Cognitive Study | 第33-41页 |
| Chapter Three THEORETICAL REVIEW | 第41-60页 |
| ·Theory of Image Schema | 第41-55页 |
| ·Significance and application of image schema | 第45-49页 |
| ·Force schemas and the application | 第49-55页 |
| ·Theory of Metaphorical Mapping Based on Image Schemas | 第55-60页 |
| Chapter Four COGNITIVE POLYSEMIC VIEWPOINTS OF MODALS | 第60-67页 |
| ·Cognitive Polysemy | 第60-64页 |
| ·Deontic Modality and Epistemic Modality | 第64-67页 |
| Chapter Five THE POLYSEMIC INTERPRETATION OF ENGLISH MODALSFROM FORCE SCHEMAS | 第67-82页 |
| ·The Polysemic Interpretation of CAN from Force Schemas | 第67-70页 |
| ·The Polysemic Interpretation of MAY from Force Schemas | 第70-73页 |
| ·The Polysemic Interpretation of MUST from Force Schemas | 第73-76页 |
| ·The Polysemic Interpretation of SHOULD From Force Schemas | 第76-78页 |
| ·The Polysemic Interpretation of WILL from Force Schemas | 第78-82页 |
| Chapter Six CONCLUSION | 第82-85页 |
| ·Summary of the Study | 第82-83页 |
| ·Limitations | 第83-85页 |
| REFERENCES | 第85-94页 |
