| Acknowledgements | 第4-6页 |
| Academic Achievements | 第6-7页 |
| 摘要 | 第7-9页 |
| Abstract | 第9-11页 |
| Abbreviation | 第18-20页 |
| Chapter One Introduction | 第20-28页 |
| 1.1 Research Background | 第20-22页 |
| 1.2 Objectives of the Present Study | 第22-24页 |
| 1.3 The Significance of the Study | 第24-26页 |
| 1.3.1 Theoretical Significance | 第24-25页 |
| 1.3.2 Practical Significance | 第25-26页 |
| 1.4 Outline of the Thesis | 第26-28页 |
| Chapter Two Literature Review | 第28-41页 |
| 2.1 Literature Review of Studies on English Conditionals | 第29-33页 |
| 2.1.1 Relevant Studies on the Classification of English Conditionals | 第29-31页 |
| 2.1.2 The Classification of English Conditionals from Grammatical Angle | 第31-33页 |
| 2.2 Literature Review of Studies on Chinese Conditionals | 第33-37页 |
| 2.3 Relevant Studies on English If-conditionals in SLA | 第37-40页 |
| 2.4 Summary | 第40-41页 |
| Chapter Three Theoretical Background | 第41-48页 |
| 3.1 The Development of Markedness Theory | 第41-42页 |
| 3.2 Markedness Theory and Language Transfer | 第42-43页 |
| 3.3 Markedness Theory in Linguistic Typology | 第43-44页 |
| 3.4 Markedness Theory and SLA in Conditionals | 第44-45页 |
| 3.5 Different Criteria of Markedness | 第45-47页 |
| 3.6 Summary | 第47-48页 |
| Chapter Four Empirical Study | 第48-56页 |
| 4.1 Research Questions | 第48页 |
| 4.2 Participants | 第48-49页 |
| 4.3 Experiment Design and Procedures | 第49-54页 |
| 4.3.1 The Experiment Design of Production Task | 第49-51页 |
| 4.3.2 The Experiment Design of Comprehension Task | 第51-54页 |
| 4.4 Scoring Standards | 第54-55页 |
| 4.5 Summary | 第55-56页 |
| Chapter Five Results | 第56-87页 |
| 5.1 Results of Production Task | 第56-69页 |
| 5.1.1 Analysis of Production Results among Four Kinds of If-conditionals by CEL | 第57-62页 |
| 5.1.2 The Result Analysis of Production between Two Different Levels of CEL | 第62-65页 |
| 5.1.3 Production Analysis on the Different Locations of the Target Items by CEL | 第65-66页 |
| 5.1.4 The Interaction between Conditional Type and If-clause Order in L2 Production | 第66-69页 |
| 5.2 Results of Comprehension Task | 第69-85页 |
| 5.2.1 Analysis of Comprehension Results among Four Kinds of If-conditionals by CEL | 第70-76页 |
| 5.2.2 The Result Analysis of Comprehension between Two Different Levels of CEL | 第76-79页 |
| 5.2.3 Comprehension Analysis on the Different Locations of the Target Items by CEL | 第79-80页 |
| 5.2.4 Analysis of the Interaction between Different Parameters of Comprehending If-conditionals by CEL | 第80-85页 |
| 5.3 Summary | 第85-87页 |
| Chapter Six Discussion | 第87-102页 |
| 6.1 Differences in the Acquisition Order of Four Types of If-Conditionals | 第87-91页 |
| 6.2 The Asymmetry between Production and Comprehension in SLA | 第91-97页 |
| 6.3 The Relationship between the Position of the Target Verb and the Production and Comprehension of Second Language | 第97-99页 |
| 6.4 Acquisition Differences between Different Groups | 第99-100页 |
| 6.5 Summary | 第100-102页 |
| Chapter Seven Conclusion | 第102-106页 |
| 7.1 Major Findings | 第102-103页 |
| 7.2 Pedagogical Implications | 第103-104页 |
| 7.3 Limitations of the Whole Study and Recommendations for Further Research | 第104-106页 |
| References | 第106-111页 |
| Appendices | 第111-121页 |
| Appendix A | 第111-115页 |
| Appendix B | 第115-121页 |
