| 摘要 | 第1-8页 |
| Abstract | 第8-13页 |
| Chapter 1 Introduction | 第13-19页 |
| ·Motivation and significance of the present research | 第13-16页 |
| ·Objectives and research questions | 第16-17页 |
| ·Data collection and research methodology | 第17-18页 |
| ·Organization of this thesis | 第18-19页 |
| Chapter 2 Literature Review | 第19-34页 |
| ·Studies on presupposition | 第19-25页 |
| ·Philosophical origin | 第19-21页 |
| ·Semantic presupposition | 第21-23页 |
| ·Pragmatic presupposition | 第23-25页 |
| ·Studies on US presidential debates | 第25-34页 |
| ·Brief history of US presidential debates | 第26-27页 |
| ·Format and rules of US presidential debates | 第27-28页 |
| ·Different approaches to US presidential debates and their limitations | 第28-34页 |
| ·Rhetorical approach | 第29-30页 |
| ·Traditional linguistic approach | 第30-31页 |
| ·Functional approach | 第31-32页 |
| ·Limitations of the previous studies | 第32-34页 |
| Chapter 3 Theoretical Foundation | 第34-44页 |
| ·Working definition of presupposition trigger | 第34-35页 |
| ·Different classifications of presupposition triggers | 第35-39页 |
| ·Yule’s classification | 第35-36页 |
| ·Verschueren’s classification | 第36-38页 |
| ·He Ziran’s classification | 第38页 |
| ·Levinson’s classification | 第38-39页 |
| ·Theoretical framework of the present research: A modified model | 第39-44页 |
| Chapter 4 Lexical Presupposition Triggers | 第44-62页 |
| ·Verbs | 第45-56页 |
| ·Descriptive verbs | 第45-48页 |
| ·Factive verbs | 第48-51页 |
| ·Change of state verbs | 第51-53页 |
| ·Iterative verbs | 第53-54页 |
| ·Verbs of judging | 第54-56页 |
| ·Proper names or a noun phrase with a definite article | 第56-58页 |
| ·Iterative adverbs | 第58-60页 |
| ·Summary | 第60-62页 |
| ChapteChapter 5 Syntactic Presupposition Triggers | 第62-76页 |
| ·Temporal clauses | 第62-64页 |
| ·Cleft sentences | 第64-67页 |
| ·Counterfactual conditionals | 第67-69页 |
| ·Questions | 第69-72页 |
| ·Non-restrictive relative clauses | 第72-75页 |
| ·Summary | 第75-76页 |
| Chapter 6 Phonological Presupposition Triggers | 第76-83页 |
| ·Implicit clefts with stressed constituents | 第76-82页 |
| ·Summary | 第82-83页 |
| Chapter 7 Conclusion | 第83-92页 |
| ·Major findings of the present research | 第83-90页 |
| ·Limitation of the present study and suggestions for further research | 第90-92页 |
| References | 第92-97页 |
| Acknowledgements | 第97-98页 |
| Articles Published | 第98页 |
