| Abstract | 第5-6页 |
| 摘要 | 第7-13页 |
| Chapter One Introduction | 第13-17页 |
| 1.1 Background of the Research | 第13-14页 |
| 1.2 General Description of the Study | 第14页 |
| 1.3 Significance of the Research | 第14-15页 |
| 1.4 Organization of the Thesis | 第15-17页 |
| Chapter Two Literature Review | 第17-41页 |
| 2.1 Theoretical Basis | 第17-30页 |
| 2.1.1 Definitions of Hedges | 第17-19页 |
| 2.1.2 Categorizations of Hedges | 第19-24页 |
| 2.1.3 Functions of Hedges | 第24-30页 |
| 2.2 Previous Researches on Hedges in China | 第30-33页 |
| 2.2.1 Researches on Theories and Applications of Hedges | 第30-31页 |
| 2.2.2 Researches on Hedges in Specific Discourse Contexts | 第31-32页 |
| 2.2.3 Researches on Hedges in College Student-produced Writings | 第32-33页 |
| 2.3 Corpus-based Studies on Hedges Abroad | 第33-41页 |
| 2.3.1 Studies on Hedges in EFL/ESL Writings | 第33-35页 |
| 2.3.2 Studies on Hedges in College Student-produced Argumentations | 第35-36页 |
| 2.3.3 Studies on Hedges Used Hyland’s List of Hedging Items | 第36-41页 |
| Chapter Three Research Methodology | 第41-53页 |
| 3.1 Research Questions | 第41-42页 |
| 3.2 Corpora Description | 第42-45页 |
| 3.2.1 General Corpora | 第42-43页 |
| 3.2.2 Sub-corpora | 第43-45页 |
| 3.3 Instruments | 第45-46页 |
| 3.4 Data Collection and Correction | 第46-53页 |
| 3.4.1 Selection of Hedges | 第46-50页 |
| 3.4.2 Searching and Correcting Data | 第50-52页 |
| 3.4.3 Analyzing Data | 第52-53页 |
| Chapter Four Results And Discussion | 第53-79页 |
| 4.1 Results | 第53-54页 |
| 4.2 Contrasting Frequency Counts of Hedges in the Two Sub-corpora | 第54-69页 |
| 4.2.1 Analysis of Results of Individual Hedges | 第54-67页 |
| 4.2.1.1 Contrasting the Results between WECCL-ss and LOCNESS-ns | 第54-62页 |
| 4.2.1.2 Contrasting the Results between WECCL-js and LOCNESS-ns | 第62-67页 |
| 4.2.2 Analysis of Results of Four Types of Hedges | 第67-69页 |
| 4.3 Contrasting Distribution of Hedges in These Two Sub-corpora | 第69-71页 |
| 4.4 Contrasting Function of Hedges in These Two Sub-corpora | 第71-76页 |
| 4.5 Tentative Reasons for Such Differences | 第76-79页 |
| 4.5.1 Language Proficiency | 第76-77页 |
| 4.5.2 Language Transfer | 第77-78页 |
| 4.5.3 Teaching-induced Factors | 第78页 |
| 4.5.4 Essays Topics/Prompts | 第78-79页 |
| Chapter Five Conclusion | 第79-84页 |
| 5.1 Major Findings | 第79-81页 |
| 5.2 Pedagogical Implications | 第81-82页 |
| 5.3 Limitations of the Research | 第82-83页 |
| 5.4 Suggestions for Further Study | 第83-84页 |
| Bibliography | 第84-91页 |
| Notes | 第91-92页 |
| Appendix | 第92-94页 |
| Acknowledgements | 第94页 |
