| 中文摘要 | 第1-6页 |
| ABSTRACT | 第6-13页 |
| Chapter One Introduction | 第13-21页 |
| ·The importance of writing | 第13页 |
| ·The significance of ACs in writing | 第13-15页 |
| ·Two criteria for successful text: cohesion & coherence | 第14-15页 |
| ·ACs serve as markers of cohesion & coherence | 第15页 |
| ·Main problems in the use of ACs | 第15-17页 |
| ·Problems caused by overuse, underuse and misuse | 第16页 |
| ·Problems caused by cultural or stylistic factors | 第16页 |
| ·Problems caused by the multifunction of ACs | 第16-17页 |
| ·Problems caused by the negative transfer of L15 | 第17页 |
| ·Aims of this research | 第17-19页 |
| ·Differences between Mongolian students and native speakers in ACs use | 第18页 |
| ·Possible reasons for Mongolian learners’ problematic use of ACs | 第18-19页 |
| ·Relation between the use of ACs and the writing quality | 第19页 |
| ·Organization of the thesis | 第19-21页 |
| Chapter Two Literature Review | 第21-38页 |
| ·Previous studies on the use of ACs for discourse cohesion | 第21-29页 |
| ·The studies on ACs abroad | 第21-22页 |
| ·The empirical studies on ACs use abroad | 第22-24页 |
| ·The studies on ACs at home | 第24-25页 |
| ·Empirical studies on ACs use in writing at home | 第25-27页 |
| ·Limitations of the previous study | 第27-29页 |
| ·The classification of ACs | 第29-38页 |
| ·The definition of ACs | 第29页 |
| ·The classifications of ACs | 第29-38页 |
| Chapter Three Theoretical Background | 第38-46页 |
| ·Interlanguage | 第38-39页 |
| ·Introduction of CIA | 第39-41页 |
| ·Corpus linguistics | 第41-46页 |
| ·An introduction to the corpus-based research | 第41-42页 |
| ·Development of corpus-based research | 第42-44页 |
| ·The advantages of corpus-based approach to the present study | 第44-46页 |
| Chapter Four Research Methods and Procedures | 第46-56页 |
| ·Corpus-based approach | 第46页 |
| ·Two corpora compiled in the present study | 第46-49页 |
| ·Learner corpus -- MSC | 第46-47页 |
| ·Native corpus—ANC | 第47-49页 |
| ·Research questions | 第49页 |
| ·Instruments | 第49-50页 |
| ·Collection and processing of the data | 第50-56页 |
| ·Identifying the search items | 第50-53页 |
| ·Data retrieval | 第53-56页 |
| Chapter Five Findings and Discussion | 第56-87页 |
| ·A general study of ACs | 第56-65页 |
| ·The overall frequencies | 第57-58页 |
| ·Distribution of different semantic types in three corpora | 第58-61页 |
| ·Functional categories of ACs | 第61-62页 |
| ·Positions of ACs in the sentences | 第62-63页 |
| ·The correlation between ACs use and the writing quality | 第63-64页 |
| ·Some possible explanations for the general findings | 第64-65页 |
| ·Specific study of ACs | 第65-86页 |
| ·Most frequently used top ten ACs in MSC and ANC – written | 第66-67页 |
| ·Top fifteen overused ACs by Mongolian EFL learners | 第67-68页 |
| ·Top eleven underused ACs by Mongolian EFL learners | 第68-70页 |
| ·Top ten ACs in the Mongolian learners’ essays across three levels | 第70-71页 |
| ·Misuse of ACs by Mongolian EFL learners | 第71-75页 |
| ·Explanations for the Mongolian EFL learners’ use of particular ACs | 第75-86页 |
| ·Summary | 第86-87页 |
| Chapter Six Conclusion | 第87-91页 |
| ·Major findings | 第87-88页 |
| ·Pedagogical implications of the study | 第88-89页 |
| ·Limitations of the study | 第89-90页 |
| ·Suggestions for further research | 第90-91页 |
| Bibliography | 第91-94页 |
| Appendices | 第94-98页 |
| Acknowledgment | 第98页 |
