| ABSTRACT | 第3-4页 |
| 摘要 | 第5-6页 |
| ACKNOWLEDGEMENTS | 第6-8页 |
| LIST OF ABBREVIATIONS | 第8-11页 |
| CHAPTER ONE INTRODUCTION | 第11-16页 |
| 1.1 Background of the study | 第11-13页 |
| 1.2 Aims of the research | 第13页 |
| 1.3 Significance of the research | 第13-14页 |
| 1.4 Organization of the thesis | 第14-16页 |
| CHAPTER TWO LITERATURE REVIEW | 第16-39页 |
| 2.1 Task and task complexity | 第16-28页 |
| 2.1.1 Definition of task | 第16-17页 |
| 2.1.2 Task complexity | 第17-22页 |
| 2.1.3 Task complexity and language production | 第22-24页 |
| 2.1.4 Empirical studies of +/-Here-and-Now dimension | 第24-28页 |
| 2.1.4.1 The definiton of +/-Here-and-Now dimension | 第24-25页 |
| 2.1.4.2 Previous studies of +/-Here-and-Now dimension | 第25-28页 |
| 2.2 Sociocultural theory and scaffolding | 第28-37页 |
| 2.2.1 Sociocultural theory | 第28-30页 |
| 2.2.2 Scaffolding | 第30-37页 |
| 2.2.2.1 Definition of scaffolding | 第30-32页 |
| 2.2.2.2 Forms and functions of scaffolding | 第32-35页 |
| 2.2.2.3 Peer scaffolding in second language learning research | 第35-37页 |
| 2.3 Research gaps | 第37-39页 |
| CHAPTER THREE RESEARCH METHODOLOGY | 第39-47页 |
| 3.1 Research questions | 第39页 |
| 3.2 Participants | 第39-40页 |
| 3.3 Instruments | 第40-43页 |
| 3.3.1 Oral narrative task picture | 第40-42页 |
| 3.3.2 Recordings of oral tasks and interviews | 第42-43页 |
| 3.3.3 Interviews | 第43页 |
| 3.4 Research design | 第43-44页 |
| 3.5 Procedure of data collection | 第44-45页 |
| 3.6 Statistical instruments and analyses | 第45页 |
| 3.7 Transcription and coding | 第45-47页 |
| CHAPTER FOUR RESULTS AND DISCUSSION | 第47-71页 |
| 4.1 Functions of peer scaffolding used by Chinese EFL learners when performingan oral task | 第47-60页 |
| 4.2 Comparison between the characteristics of peer scaffolding used in differenttask complexity conditions | 第60-64页 |
| 4.3 Effects of peer scaffolding on learners’ oral production under different taskcomplexity conditions | 第64-71页 |
| CHAPTER FIVE CONCLUSION AND IMPLICATIONS | 第71-75页 |
| 5.1 Major findings | 第71-72页 |
| 5.2 Implications | 第72-73页 |
| 5.3 Limitations and recommendations for future research | 第73-75页 |
| REFERENCES | 第75-84页 |
| APPENDICES | 第84-93页 |
