| Acknowledgements | 第6-7页 |
| Abstract | 第7-8页 |
| 摘要 | 第9-13页 |
| Chapter One Introduction | 第13-18页 |
| 1.1 Research Background | 第13-15页 |
| 1.2 Research Questions and Research Significance | 第15页 |
| 1.3 Data Collection and Methodology | 第15-16页 |
| 1.4 Layout of the Thesis | 第16-18页 |
| Chapter Two Literature Review | 第18-34页 |
| 2.1 Introduction | 第18页 |
| 2.2 Previous Studies on Prepositional Polysemy | 第18-32页 |
| 2.2.1 Traditional Studies on Prepositional Polysemy | 第19-22页 |
| 2.2.2 Cognitive Studies on Prepositional Polysemy | 第22-31页 |
| 2.2.3 Studies on Polysemy of the English Preposition FOR | 第31-32页 |
| 2.3 Summary | 第32-34页 |
| Chapter Three Theoretical Framework | 第34-50页 |
| 3.1 Introduction | 第34页 |
| 3.2 Overview of Cognitive Linguistics | 第34-37页 |
| 3.2.1 Definition of Cognitive Linguistics | 第34-36页 |
| 3.2.2 Foundational Works of Cognitive Linguistics | 第36页 |
| 3.2.3 Two Key Commitments of Cognitive Linguistics | 第36-37页 |
| 3.3 Principled Polysemy Model | 第37-49页 |
| 3.3.1 Some Basic Assumptions | 第38-39页 |
| 3.3.2 Spatial Scene and Proto-scene | 第39-41页 |
| 3.3.3 Systematic and Highly Motivated Network | 第41-46页 |
| 3.3.4 Cognitive Devices for Meaning Extension | 第46-49页 |
| 3.4 Summary | 第49-50页 |
| Chapter Four The Semantic Network for the Preposition FOR | 第50-71页 |
| 4.1 Introduction | 第50页 |
| 4.2 The Cognitive Analysis of the Primary Sense of the Preposition FOR | 第50-59页 |
| 4.2.1 Meanings of the Preposition FOR | 第50-53页 |
| 4.2.2 The Proposed Proto-scene for the Preposition FOR | 第53-55页 |
| 4.2.3 Five Linguistic Criteria to Test the Proto-Scene | 第55-59页 |
| 4.3 Meaning Extension of the Preposition FOR | 第59-70页 |
| 4.3.1 The Proposed Semantic Network for the Preposition FOR | 第60-61页 |
| 4.3.2 The Cognitive Analysis of the Distinct Senses of the Preposition FOR | 第61-70页 |
| 4.4 Summary | 第70-71页 |
| Chapter Five Conclusion | 第71-74页 |
| 5.1 Major Findings of the Study | 第71-72页 |
| 5.2 Limitations of the Study | 第72-73页 |
| 5.3 Suggestions for Further Studies | 第73-74页 |
| References | 第74-81页 |
