| ABSTRACT | 第3页 |
| 摘要 | 第4-5页 |
| ACKNOWLEDGEMENTS | 第5-9页 |
| LIST OF ABBREVIATION | 第9-12页 |
| CHAPTER ONE INTRODUCTION | 第12-17页 |
| 1.1 Research background and objectives | 第12-14页 |
| 1.2 Motivation and significance of the study | 第14-16页 |
| 1.3 Organization of the thesis | 第16-17页 |
| CHAPTER TWO LITERATURE REVIEW | 第17-37页 |
| 2.1 Shell nouns | 第17-23页 |
| 2.1.1 Definition of SNs | 第17-19页 |
| 2.1.2 Functions of SNs | 第19-20页 |
| 2.1.3 The lexicogrammtical structure of SNs | 第20-22页 |
| 2.1.4 Abstract nouns as cohesive devices | 第22-23页 |
| 2.2 Previous corpus studies on SN in academic writing | 第23-30页 |
| 2.2.1 Previous SN corpus studies on expert academic writing | 第23-26页 |
| 2.2.2 Previous SN corpus studies on discipline-specific student writing | 第26-30页 |
| 2.3 Abstracts as a sub-genre | 第30-32页 |
| 2.4 Lexical bundles | 第32-33页 |
| 2.5 Corpus-informed framework | 第33-36页 |
| 2.6 Chapter summary | 第36-37页 |
| CHAPTER THREE RESEARCH METHODOLOGY | 第37-46页 |
| 3.1 Research questions | 第37-38页 |
| 3.2 The corpora used | 第38-39页 |
| 3.3 Corpus construction and annotation | 第39-42页 |
| 3.4 Corpus tools used in the study | 第42-45页 |
| 3.5 Chapter summary | 第45-46页 |
| CHAPTER FOUR RESULTS AND DISCUSSION | 第46-82页 |
| 4.1 Moves in RA abstract | 第46-47页 |
| 4.2 Distribution of SN lexical bundles in CRAC and NRAC | 第47-55页 |
| 4.2.1 Overall distribution of SN lexical bundles in CRAC and NRAC | 第47-49页 |
| 4.2.2 Distribution of SN bundles in CRAC | 第49-51页 |
| 4.2.3 Distribution of SN bundles in NRAC | 第51-52页 |
| 4.2.4 Comparison of SN lexical bundles in CRAC and NRAC | 第52-55页 |
| 4.3 Comparison of structural categories of lexical bundles in CRAC and NRAC | 第55-62页 |
| 4.3.1 Comparison of structural categories of SN bundles in PTR | 第58-60页 |
| 4.3.2 Comparison of structural categories of SN bundles in STF | 第60-61页 |
| 4.3.3 Comparison of structural categories of SN bundles in DTR | 第61-62页 |
| 4.4 Comparison of cohesive function of SN in CRAC and NRAC | 第62-80页 |
| 4.4.1 Overall distribution of lexicogrammatical patterns of SN | 第63-66页 |
| 4.4.2 SN cohesive function of N-be/V-cl pattern in CRAC and NRAC | 第66-71页 |
| 4.4.3 SN cohesive function of th-N pattern in CRAC and NRAC | 第71-78页 |
| 4.4.4 SN cohesive function of N-CL pattern in CRAC and NRAC | 第78-80页 |
| 4.5 Chapter summary | 第80-82页 |
| CHAPTER FIVE CONCLUSION | 第82-86页 |
| 5.1 Summary of the finings | 第82-84页 |
| 5.2 Implications of the research | 第84页 |
| 5.3 Limitations of the research | 第84-86页 |
| REFERENCES | 第86-94页 |
