| Acknowledgements | 第4-5页 |
| Abstract | 第5-6页 |
| 摘要 | 第7-11页 |
| List of Abbreviations | 第11-15页 |
| Chapter 1 Introduction | 第15-19页 |
| 1.1 Research Background | 第15-16页 |
| 1.2 Purpose and Significance | 第16-17页 |
| 1.3 Structure of the Thesis | 第17-19页 |
| Chapter 2 Literature Review | 第19-36页 |
| 2.1 The Theoretical Basis | 第19-26页 |
| 2.1.1 The Definition of Lexical Chunks | 第19-22页 |
| 2.1.2 The Classification of Lexical Chunks | 第22-25页 |
| 2.1.3 The Identification of Lexical chunks | 第25-26页 |
| 2.2 The Function of Lexical Chunks in Second Language Acquisition | 第26-28页 |
| 2.3 The Previous Research on Lexical Chunks of Preposition | 第28-36页 |
| 2.3.1 The Previous Research of Lexical Chunks of Preposition Abroad | 第29-31页 |
| 2.3.2 The Previous Research on Lexical Chunks of Preposition at Home | 第31-36页 |
| Chapter 3 Methodology | 第36-48页 |
| 3.1 Research Questions | 第36页 |
| 3.2 Corpus | 第36-40页 |
| 3.2.1 Learner's Corpus SWECCL 2.0 | 第36-37页 |
| 3.2.2 The Generation of the Sub-corpora of WECCL | 第37-38页 |
| 3.2.3 Native-corpora: FROWN and FLOB | 第38-40页 |
| 3.3 Instruments | 第40-43页 |
| 3.3.1 AntConc 3.4.4w | 第40-41页 |
| 3.3.2 SPSS 22.0 | 第41-43页 |
| 3.4 Research Procedure | 第43-48页 |
| 3.4.1 The Criteria for Extraction of IN Lexical chunks | 第43-44页 |
| 3.4.2 Manual Filtering | 第44-45页 |
| 3.4.3 The Classification of IN Lexical Chunks | 第45-46页 |
| 3.4.4 Statistics | 第46页 |
| 3.4.5 The Deviation of IN Lexical Chunks | 第46-48页 |
| Chapter 4 Results and Discussion | 第48-68页 |
| 4.1 The Frequency and Variety of IN Lexical Chunks in the Four Corpora | 第48-51页 |
| 4.1.1 The Data Description of the four corpora | 第48-50页 |
| 4.1.2 The Comparison of Frequency and Variety of IN Lexical Chunks Acrossthe Four Corpora | 第50-51页 |
| 4.2 The Comparison of the length of IN lexical Chunks Across the Four Corpora | 第51-54页 |
| 4.2.1 The Data Description of IN Lexical Chunks of Different Lengths | 第52-53页 |
| 4.2.2 The Analysis of the Distribution of IN Lexical Chunks of DifferentLength | 第53-54页 |
| 4.3 the Distribution of Different Categories of IN Lexical Chunks Across the FourCorpora | 第54-68页 |
| 4.3.1 Data Description of the Five Categories of IN Lexical Chunks Across theFour Corpora | 第54-56页 |
| 4.3.2 The Distribution of Five Categories of IN Lexical Chunks | 第56-59页 |
| 4.3.3 The Analysis of Clause Builder of IN Lexical Chunks | 第59-61页 |
| 4.3.4 The Analysis of Clause Constituents | 第61-63页 |
| 4.3.5 The Analysis of Semi-complete Phrase | 第63-64页 |
| 4.3.6 The Analysis of IN+NP Phrasal Structure | 第64-65页 |
| 4.3.7 The Analysis of Polywords | 第65-68页 |
| Chapter 5 Conclusion | 第68-72页 |
| 5.1 Major Findings | 第68-69页 |
| 5.2 Pedagogical Implication | 第69-70页 |
| 5.3 Limitations | 第70-71页 |
| 5.4 Suggestions for Further Research | 第71-72页 |
| References | 第72-78页 |
| Appendices | 第78-87页 |
| 攻读硕士期间科研成果 | 第87页 |
