| Acknowledgements | 第1-5页 |
| Abstract | 第5-8页 |
| 摘要 | 第8-14页 |
| Chapter One Introduction | 第14-18页 |
| ·Research Background | 第14-15页 |
| ·Necessity and Significance of the Study | 第15-16页 |
| ·Research Objectives | 第16-17页 |
| ·Organization of the Thesis | 第17-18页 |
| Chapter Two Literature Review | 第18-31页 |
| ·An Overview of Grammaticalization Studies | 第18-27页 |
| ·The Definition of Grammaticalization | 第18-20页 |
| ·The Development of the Grammaticalization Theory | 第20-23页 |
| ·Methods of judging the level of grammaticalization | 第23-24页 |
| ·Characteristics in Grammaticalization | 第24-27页 |
| ·Relevant Studies on YOU KNOW | 第27-29页 |
| ·Studies on YOU KNOW as a discourse marker | 第27-28页 |
| ·Meanings and Functions of YOU KNOW | 第28-29页 |
| ·Summary | 第29-31页 |
| Chapter Three Methodology | 第31-37页 |
| ·Research Questions | 第31页 |
| ·Corpora and Tools | 第31-32页 |
| ·Data Collection and Analysis Procedures | 第32-37页 |
| Chapter Four Results and Discussion | 第37-57页 |
| ·The Process of the Grammaticalization of YOU KNOW | 第37-49页 |
| ·YOU KNOW expressing lexical meaning | 第38-42页 |
| ·YOU KNOW performing textual functions | 第42-43页 |
| ·YOU KNOW performing interpersonal functions | 第43-46页 |
| ·Exceptions | 第46-49页 |
| ·The Characteristics of the Grammaticalization of YOU KNOW | 第49-57页 |
| ·Graduality | 第49-50页 |
| ·Unidirectionality and Abstraction | 第50-52页 |
| ·Persistence and Specialization | 第52-55页 |
| ·Subjectification | 第55-57页 |
| Chapter Five Conclusions | 第57-61页 |
| ·Major Findings of the study | 第57-58页 |
| ·Theoretical and Practical Implications | 第58-59页 |
| ·Limitations of the Study and Suggestions for Further Research | 第59-61页 |
| Works Cited | 第61-67页 |
| Publications | 第67页 |
