| 摘要 | 第1-7页 |
| ABSTRACT | 第7-10页 |
| Contents | 第10-12页 |
| Chapter One Introduction | 第12-16页 |
| ·Research background | 第12-13页 |
| ·Purpose and significance of the research | 第13-14页 |
| ·Framework of the thesis | 第14-16页 |
| Chapter Two Literature Review | 第16-27页 |
| ·Introduction of lexical chunks | 第16-21页 |
| ·Definitions | 第16-19页 |
| ·Classifications | 第19-21页 |
| ·Research review abroad | 第21-22页 |
| ·Research review in China | 第22-25页 |
| ·General trend of the research development | 第22-23页 |
| ·Research contents and main achievements | 第23-25页 |
| ·Research methods | 第25页 |
| ·Summary | 第25-27页 |
| Chapter Three Methodology | 第27-37页 |
| ·Research questions | 第27-28页 |
| ·Instruments | 第28-30页 |
| ·Main corpus WECCL | 第28-29页 |
| ·Contrastive corpus ICLE | 第29-30页 |
| ·Contrastive corpus LOCNESS | 第30页 |
| ·Research tools | 第30-33页 |
| ·Sub-corpus Generator | 第30-31页 |
| ·AntConc | 第31-32页 |
| ·Chi-square Calculator | 第32-33页 |
| ·Research procedures | 第33-35页 |
| ·Sub-corpus generating | 第33-34页 |
| ·Word list generating | 第34页 |
| ·Concordance hits extracting | 第34-35页 |
| ·Data analysis | 第35-37页 |
| Chapter Four Results and Discussions | 第37-44页 |
| ·General characteristics on learners’ use of lexical chunks | 第37-38页 |
| ·Significant differences between EFL learners and native speakers | 第38-39页 |
| ·A comparison between WECCL and ICLE | 第38-39页 |
| ·A comparison between WECCL and LOCNESS | 第39页 |
| ·Significant differences among Chinese EFL learners at different levels | 第39-41页 |
| ·Analysis of the reasons that cause these differences | 第41-44页 |
| ·Learners’ insufficient mastery of lexical chunks | 第41-42页 |
| ·Intentionally avoiding mistakes | 第42页 |
| ·Negative transfer of L1 | 第42-43页 |
| ·Learners’ limited language ability | 第43-44页 |
| Chapter Five Conclusion | 第44-48页 |
| ·Major findings of the present study | 第44-45页 |
| ·Pedagogical implications | 第45-46页 |
| ·Limitations of the study | 第46页 |
| ·Recommendations for future research | 第46-48页 |
| References | 第48-51页 |
| Appendix1 Sub-corpus of Grade 1 | 第51-52页 |
| Appendix2 Sub-corpus of Grade 2 | 第52-53页 |
| Appendix3 Sub-corpus of Grade 3 | 第53-54页 |
| Appendix4 Sub-corpus of Grade 4 | 第54-55页 |
| Appendix5 The Concordance Hits of in my opinion inWECCL 2.0 | 第55-56页 |
| Appendix6 The Concordance Hits of in my opinion inSub-corpus of Grade 1 | 第56-57页 |
| Appendix7 The Concordance Hits of in my opinion inSub-corpus of Grade 2 | 第57-58页 |
| Appendix8 The Concordance Hits of in my opinion inSub-corpus of Grade 3 | 第58-59页 |
| Appendix9 The Concordance Hits of in my opinion inSub-corpus of Grade 4 | 第59-60页 |
| List of Abbreviations | 第60-61页 |
| List of Figures and Tables | 第61-62页 |
| Acknowledgements | 第62-63页 |
| Introduction of the Author | 第63页 |
