| Acknowledgements | 第1-6页 |
| 摘要 | 第6-8页 |
| Abstract | 第8-12页 |
| Chapter One Introduction | 第12-16页 |
| ·Background | 第12-13页 |
| ·Research questions | 第13-14页 |
| ·Overall stucture of the thesis | 第14-16页 |
| Chapter Two Related Literature:A Critical Review | 第16-33页 |
| ·Lexical chunks | 第16-29页 |
| ·Definitions of lexical chunks | 第16-18页 |
| ·Classifications of lexical chunks | 第18-22页 |
| ·Lexical chunks in terms of structure | 第18-21页 |
| ·Lexical chunks in terms of function | 第21-22页 |
| ·Functions of lexical chunks | 第22-25页 |
| ·Lexical chunks in second language acquisition | 第25-28页 |
| ·Psychological reality of lexical chunks | 第28-29页 |
| ·Lexical chunks and language teaching | 第29-33页 |
| ·Lewis' Lexical Approach | 第29-32页 |
| ·Nattinger & DeCarrico's Lexical Approach | 第32-33页 |
| Chapter Three Lexical Chunks and Written Discourse | 第33-45页 |
| ·Lexical chunks and language competence | 第33-35页 |
| ·Lexical chunks and language output | 第35-39页 |
| ·Lexical chunks and creative language production | 第35-36页 |
| ·Effects of lexical chunks on language output | 第36-39页 |
| ·Characteristics of lexical chunks in English writing | 第39-43页 |
| ·Lexical chunks and writing pedagogy | 第43-45页 |
| Chapter Four Research Methodology | 第45-49页 |
| ·Objectives | 第45页 |
| ·Participants | 第45-46页 |
| ·Instruments | 第46页 |
| ·Procedure | 第46页 |
| ·Data Collection | 第46-49页 |
| ·Grouping | 第47页 |
| ·Classication of lexical chunks | 第47页 |
| ·Collection of data | 第47-49页 |
| Chapter Five Results and Discussion | 第49-66页 |
| ·Quantitative Analysis | 第49-57页 |
| ·Comparison on frequency of lexical chunks between two groups | 第49-50页 |
| ·Comparison on the four structural categories of lexical chunks in two groups | 第50-57页 |
| ·Comparison within each group | 第53-55页 |
| ·Comparison between two groups | 第55-57页 |
| ·Qualitative Analysis | 第57-66页 |
| ·Comparison on the frequently used lexical chunks in two groups | 第58-60页 |
| ·Comparison on some typical functional lexical chunks between two groups | 第60-65页 |
| ·An analysis of lexical chunks for making assertion in two groups | 第60-63页 |
| ·An analysis of lexical chunks with cohesive devices in two groups | 第63-65页 |
| ·Summary of differences of the lexical chunks between two groups | 第65-66页 |
| Chapter Six Conclusions | 第66-70页 |
| ·Major findings of the study | 第66-67页 |
| ·Pedagogical implications | 第67-68页 |
| ·Limitations of the study | 第68页 |
| ·Areas for further research | 第68-70页 |
| References | 第70-75页 |
| Appendices | 第75-82页 |
| Appendix Ⅰ Classification of Lexical Chunks in Two Sample Compositions | 第75-77页 |
| Appendix Ⅱ Scores of 60 Sample Compositions | 第77-79页 |
| Appendix Ⅲ the Number of Four Categories of Lexical Chunks Used in Two Groups | 第79-81页 |
| Appendix Ⅳ Writing Test | 第81-82页 |
| Appendix Ⅴ Grading Criterion for CET-4 | 第82页 |
