| Acknowledgements | 第1-5页 |
| Abstract | 第5-7页 |
| 摘要 | 第7-9页 |
| Contents | 第9-11页 |
| List of Tables | 第11-12页 |
| List of Figures | 第12-13页 |
| Chapter One Introduction | 第13-17页 |
| ·Background of the study | 第13-14页 |
| ·Purpose and significance of the study | 第14-15页 |
| ·Research questions | 第15-16页 |
| ·Organization of the paper | 第16-17页 |
| Chapter Two Literature review | 第17-27页 |
| ·Early studies on collocations | 第17-18页 |
| ·Corpus-based research on recurrent word combinations | 第18-19页 |
| ·Previous studies of lexical bundles | 第19-23页 |
| ·Definitions of lexical bundles | 第19-21页 |
| ·Classifications of lexical bundles | 第21-23页 |
| ·Studies of lexical bundles abroad and home | 第23-27页 |
| ·Studies on lexical bundles abroad | 第23-25页 |
| ·Studies on lexical bundles in China | 第25-27页 |
| Chapter Three Methodology | 第27-36页 |
| ·Corpora | 第27-29页 |
| ·Analysis approach | 第29页 |
| ·Research procedures | 第29-36页 |
| ·Data collection | 第29-32页 |
| ·Data analysis | 第32-36页 |
| Chapter Four Results | 第36-56页 |
| ·Distribution of the four-word lexical bundles | 第36-38页 |
| ·The most frequent four-word lexical bundles | 第38-42页 |
| ·Four-word lexical bundles across structural types | 第42-49页 |
| ·Structural characteristics of four-word lexical bundles in NNWC | 第43-45页 |
| ·Structural characteristics of four-word lexical bundles in NWC | 第45-47页 |
| ·Comparison of structural distribution between two corpora | 第47-49页 |
| ·Four-word lexical bundles across functional types | 第49-56页 |
| ·Functional characteristics of four-word lexical bundles in NNWC | 第50-51页 |
| ·Functional characteristics of four-word lexical bundles in NWC | 第51-52页 |
| ·Comparison of functional distribution between two corpora | 第52-56页 |
| Chapter Five Conclusions | 第56-61页 |
| ·Major findings of the study | 第56-57页 |
| ·Implications for the learning and teaching of lexical bundles in writing | 第57-59页 |
| ·Raising awareness of lexical bundles in teaching and learning English writing | 第58-59页 |
| ·Using knowledge of lexical bundles to enhance lfuentproduction in academic writing | 第59页 |
| ·Limitations of the study and suggestions for further studies | 第59-61页 |
| References | 第61-66页 |
| Appendices | 第66-74页 |
| Publications | 第74页 |
