| Acknowledgements | 第6-7页 |
| Abstract | 第7-8页 |
| 摘要 | 第9-16页 |
| List of Abbreviations | 第16-17页 |
| Chapter 1 Introduction | 第17-21页 |
| 1.1 Background of the Study | 第17-18页 |
| 1.2 Significance of the Study | 第18-19页 |
| 1.3 Overall Structure of the Thesis | 第19-21页 |
| Chapter 2 Literature Review | 第21-45页 |
| 2.1 Relevant Studies on You Know at Home and Abroad | 第21-27页 |
| 2.1.1 Studies Abroad | 第21-24页 |
| 2.1.2 Studies at Home | 第24-27页 |
| 2.2 Theory of Grammaticalization | 第27-39页 |
| 2.2.1 Definitions of Grammaticalization | 第27-31页 |
| 2.2.2 Mechanisms of Grammaticalization | 第31-34页 |
| 2.2.3 Features of Grammaticalization | 第34-39页 |
| 2.3 Pragmatic Markers | 第39-45页 |
| 2.3.1 Definitions of Pragmatic Markers | 第40-41页 |
| 2.3.2 Features of Pragmatic Markers | 第41-45页 |
| Chapter 3 Research Methodology | 第45-50页 |
| 3.1 Research Questions | 第45-46页 |
| 3.2 Data Collection | 第46-48页 |
| 3.3 Data Presentation | 第48-50页 |
| Chapter 4 Analysis of the Grammaticalization of You Know Based on the Theory of Grammaticalization | 第50-84页 |
| 4.1 Causes of the Grammaticalization of You Know | 第50-60页 |
| 4.1.1 High Frequency of Use | 第50-52页 |
| 4.1.2 Syntactic Factors | 第52-55页 |
| 4.1.3 Social Factors | 第55-57页 |
| 4.1.4 Pragmatic Factors | 第57-60页 |
| 4.2 Development of the Function of You Know under the Mechanism of Grammaticalization | 第60-76页 |
| 4.2.1 Development of the Function of You Know under the Reanalysis Mechanism | 第60-73页 |
| 4.2.2 Development of the Function of You Know under the Analogy Mechanism | 第73-76页 |
| 4.3 Features of You Know in the Process of Grammaticalization | 第76-84页 |
| 4.3.1 Unidirectionality | 第77-78页 |
| 4.3.2 Graduality | 第78-79页 |
| 4.3.3 Abstraction | 第79-82页 |
| 4.3.4 Persistence | 第82-84页 |
| Chapter 5 Conclusion | 第84-87页 |
| 5.1 Major Findings of the Study | 第84-85页 |
| 5.2 Limitations of the Study | 第85页 |
| 5.3 Suggestions for Further Study | 第85-87页 |
| References | 第87-93页 |
