| Abstract | 第1-6页 |
| 摘要 | 第6-9页 |
| Introduction | 第9-13页 |
| ·Significance and Aims of the Study | 第9-10页 |
| ·Outline of the Thesis | 第10-13页 |
| Chapter One Literature Review | 第13-23页 |
| ·Studies on Conditionals Abroad | 第13-21页 |
| ·Logical and Philosophical Perspectives | 第13-14页 |
| ·Pedagogical Grammar | 第14-16页 |
| ·Purely Descriptive Approach | 第16-17页 |
| ·Constructional Approach | 第17-19页 |
| ·Pragmatic-Cognitive Perspective | 第19-21页 |
| ·Studies on Conditionals at Home | 第21-23页 |
| Chapter Two Structural and Semantic Analyses of If-Conditionals | 第23-38页 |
| ·Structural Analysis of If-conditionals | 第24-27页 |
| ·Semantic Analysis of If-conditionals | 第27-38页 |
| ·Direct Conditionals | 第29-33页 |
| ·Indirect Conditionals | 第33-38页 |
| Chapter Three Theoretical Foundations of this Study | 第38-51页 |
| ·Categorization | 第38-39页 |
| ·The Classical Theory of Categorization | 第39-40页 |
| ·The Prototype Theory | 第40-51页 |
| ·Definition of the Prototype | 第41-42页 |
| ·Characteristics of the Prototype Category | 第42-44页 |
| ·Important Concepts of the Prototype Theory | 第44-48页 |
| ·Family Resemblance | 第44-46页 |
| ·Fuzzy Boundary | 第46-48页 |
| ·Application of the Prototype Theory | 第48-51页 |
| Chapter Four Prototype Analyses of If-conditionals | 第51-83页 |
| ·Prototypes of the If-conditional Category | 第52-55页 |
| ·Characteristics of the Prototypes | 第55-62页 |
| ·Non-prototypes of the If-conditional Category | 第62-64页 |
| ·Characteristics of the Non-prototypes | 第64-70页 |
| ·The Relationship Between Prototypes and Non-prototypes | 第70-78页 |
| ·Fuzziness of the If-conditional Category | 第78-83页 |
| Chapter Five Extension of the If-conditional Category | 第83-97页 |
| ·Extension as a Chain-like Structure | 第83-85页 |
| ·Cognitive Motivation of the Extension | 第85-89页 |
| ·Metonymy as the Mechanism of the Extension | 第89-97页 |
| Conclusion | 第97-101页 |
| Bibliography | 第101-109页 |
| 附录 | 第109-111页 |
| Acknowledgements | 第111-113页 |
