| Acknowledgements | 第1-6页 |
| Abstract | 第6-8页 |
| 内容摘要 | 第8-11页 |
| Chapter 1 Introduction | 第11-20页 |
| ·Introduction | 第11-12页 |
| ·Purpose and significance of the study | 第12-13页 |
| ·Methodology | 第13页 |
| ·Terms in this paper | 第13-18页 |
| ·Code and code-switching | 第14-15页 |
| ·Code-switching and code mixing | 第15-16页 |
| ·Code-switching and borrowing | 第16-17页 |
| ·Code-switching and diglossia | 第17-18页 |
| ·Outline of the thesis | 第18-20页 |
| Chapter 2 Review of the Relevant Literature | 第20-31页 |
| ·Introduction | 第20页 |
| ·Researches on code-switching | 第20-29页 |
| ·Researches done by foreign scholars | 第21-27页 |
| ·Sociolinguistic approach | 第22-24页 |
| ·Grammatical approach | 第24-26页 |
| ·Psycholinguistic approach | 第26-27页 |
| ·Conversational analysis approach | 第27页 |
| ·Researches done by Chinese scholars | 第27-29页 |
| ·The study of code-switching in Fortress Besieged | 第29-31页 |
| Chapter 3 The Grammatical Constraints on Code-switching in Fortress Besieged | 第31-40页 |
| ·Introduction | 第31-32页 |
| ·Matrix Language-Frame Model | 第32-36页 |
| ·Matrix language and embedded language | 第33页 |
| ·Three types of constituents | 第33-35页 |
| ·The ML hypothesis | 第35-36页 |
| ·Analysis | 第36-38页 |
| ·Summary | 第38-40页 |
| Chapter 4 The Pragmatic Functions of Code-switching in Fortress Besieged | 第40-66页 |
| ·Introduction | 第40-42页 |
| ·Yu Guodong's Pragmatic model of code-switching | 第42-44页 |
| ·Code-switching as a strategy for making communication more convenient | 第44-48页 |
| ·Lexis gap and semantic or pragmatic mismatch | 第45-46页 |
| ·Analysis | 第46-48页 |
| ·Code-switching as a strategy for avoiding social embarrassment | 第48-53页 |
| ·Social conventions | 第48-49页 |
| ·Analysis | 第49-53页 |
| ·Code-switching as a strategy for fulfilling one's psychological needs | 第53-63页 |
| ·Psychological needs | 第53-54页 |
| ·Analysis | 第54-63页 |
| ·Code-switching as humor-creating strategy | 第54-56页 |
| ·Code-switching as hearer-excluding strategy | 第56-58页 |
| ·Code-switching as authenticity-keeping strategy | 第58-59页 |
| ·Code-switching as showing-off strategy | 第59-61页 |
| ·Code-switching as mitigation strategy | 第61-62页 |
| ·Code-switching as emphasis or explanation strategy | 第62-63页 |
| ·Summary | 第63-66页 |
| Chapter 5 Conclusion | 第66-69页 |
| Bibliography | 第69-71页 |
