| Acknowledgements | 第1-5页 |
| Abstract (English version) | 第5-8页 |
| Abstract (Chinese version) | 第8-12页 |
| List of appendixes | 第12页 |
| List of tables and figures | 第12-13页 |
| List of acronyms | 第13-14页 |
| Chapter 1 Introduction | 第14-18页 |
| ·Origin of the view | 第14-15页 |
| ·Significance of the study | 第15-16页 |
| ·Methods of the research | 第16-17页 |
| ·Organization of the thesis | 第17-18页 |
| Chapter 2 Review of related literature | 第18-37页 |
| ·Definitions of lexical chunks or similar concepts | 第18-20页 |
| ·Classifications of lexical chunks | 第20-24页 |
| ·Lexical chunks and language acquisition | 第24-28页 |
| ·Neurolinguistic status of automatic speech | 第24-25页 |
| ·Lexical chunks in first language acquisition | 第25-27页 |
| ·Lexical chunks in second language acquisition | 第27-28页 |
| ·Functions of lexical chunks | 第28-31页 |
| ·Functions of lexical chunks in discourse | 第29-30页 |
| ·The organizing functions of lexical chunks | 第30-31页 |
| ·T he Lexical Approach for teaching and learning | 第31-37页 |
| ·Background | 第32页 |
| ·Key principles, beliefs and main ideas of the Lexical Approach | 第32-34页 |
| ·Activities used in developing learners’knowledge of lexical chunks | 第34-35页 |
| ·The pedagogical implications of the Lexical Approach | 第35-37页 |
| Chapter 3 The effect of lexical chunks on language output | 第37-47页 |
| ·Language output: an autonomous model or a parallel one | 第37-38页 |
| ·The effect of lexical chunks on language output | 第38-47页 |
| ·Facilitating language production | 第39-40页 |
| ·Easing the burden of language processing | 第40-41页 |
| ·Enhancing the fluency and accuracy of language output | 第41-44页 |
| ·Helping internalizing and establishing grammatical rules | 第44-47页 |
| Chapter 4 Experiment | 第47-56页 |
| ·Hypothesis | 第47页 |
| ·Subjects | 第47-48页 |
| ·Research design | 第48-50页 |
| ·Instrument and teaching materials | 第50-52页 |
| ·Writing tests and scoring | 第50页 |
| ·Oral proficiency interviews | 第50-51页 |
| ·Teaching materials | 第51-52页 |
| ·Guidelines and instructional procedures in the EC | 第52-56页 |
| Chapter 5 Results and discussions of the experiment | 第56-66页 |
| ·Result analysis of the experiment | 第56-62页 |
| ·Result analysis of three writing tests between the CC and EC | 第56-60页 |
| ·Result analysis of two speaking tests in the EC and CC | 第60-62页 |
| ·Error analysis of learners’use of lexical chunks | 第62-66页 |
| ·D eviated use of lexical chunks | 第63-64页 |
| ·Interference from the mother tongue | 第64-66页 |
| Chapter 6 Suggestions and conclusions | 第66-75页 |
| ·Suggestions on lexical teaching and learning | 第66-70页 |
| ·Major findings | 第70-71页 |
| ·Pedagogical implications | 第71-73页 |
| ·Limitations and suggestions for future research | 第73-75页 |
| References | 第75-81页 |
| Appendixes | 第81-87页 |
