| Abstract | 第1-7页 |
| 摘要 | 第7-12页 |
| Chapter I Introduction | 第12-14页 |
| ·Research background | 第12页 |
| ·Significance of the study | 第12-13页 |
| ·Structure of the thesis | 第13-14页 |
| Chapter II Literature Review | 第14-21页 |
| ·Definition and classification of modality | 第14-15页 |
| ·Definition and classification of modal verbs | 第15-16页 |
| ·Modal sequences | 第16-17页 |
| ·Previous studies of modal sequences | 第17-21页 |
| ·The previous studies of modal verbs | 第18-19页 |
| ·The studies of modal sequences abroad | 第19页 |
| ·The studies of modal sequences at home | 第19-21页 |
| Chapter III Theoretical Foundation | 第21-24页 |
| ·Corpus-based approach | 第21-22页 |
| ·Contrastive Interlanguage Analysis (CIA) | 第22-24页 |
| Chapter IV Methodology | 第24-30页 |
| ·Research questions | 第24页 |
| ·Related corpora | 第24-25页 |
| ·SECCL 2.0 | 第24-25页 |
| ·MICASE | 第25页 |
| ·Data selected from SECCL 2.0 and MICASE | 第25页 |
| ·Research procedures | 第25-27页 |
| ·Research instruments | 第27-30页 |
| Chapter V Results and Discussion | 第30-46页 |
| ·The overall frequency of modal verbs | 第30-32页 |
| ·The frequency of modal verbs in SECCL2.0 | 第30-31页 |
| ·The frequency of modal verbs in MICASE | 第31页 |
| ·The comparison of modal verbs between SECCL2.0 and MICASE | 第31-32页 |
| ·The frequency of modal sequences in SECCL2.0 and MICASE | 第32-37页 |
| ·The overused modal sequences | 第33-35页 |
| ·The underused modal sequences | 第35-37页 |
| ·The semantic types of modal sequences | 第37-40页 |
| ·“modal verb”+“dynamic / stative verb” | 第38-39页 |
| ·“animate / inanimate subject”+“modal verb” | 第39-40页 |
| ·The comparison of modal sequences between TEM-4 and TEM-8 | 第40-42页 |
| ·Reasons involved | 第42-46页 |
| ·L1 transfer | 第43页 |
| ·The acquisition order | 第43页 |
| ·Teaching strategy | 第43-44页 |
| ·Thinking differences | 第44-46页 |
| ·Ethical and cognitive type | 第44页 |
| ·Intentionality and objectivity | 第44-45页 |
| ·Conservative thinking and risk-taking | 第45-46页 |
| Chapter VI Conclusion | 第46-50页 |
| ·Major findings | 第46-47页 |
| ·Pedagogical implications | 第47-49页 |
| ·Implications in the teaching process | 第47-48页 |
| ·Implications in automatic scoring system | 第48-49页 |
| ·Limitations | 第49-50页 |
| Appredix I | 第50-52页 |
| Appredix II | 第52-53页 |
| Appredix III | 第53-55页 |
| Appendix IV | 第55-56页 |
| Bibliography | 第56-61页 |
| Papers Published during MA Program | 第61-62页 |
| Acknowledgements | 第62-63页 |
