| ACKNOWLEDGEMENTS | 第1-7页 |
| CONTENTS | 第7-9页 |
| 1 INTRODUCTION | 第9-11页 |
| 2 THE NECESSITY OF THE ROLE OF TEACHERS AS MEDIATORS AND ITS CAUSES | 第11-23页 |
| ·Traditional teachers' role and its weaknesses | 第11-14页 |
| ·Description of traditional effective teachers | 第11-12页 |
| ·Teachers' lack of reflection | 第12-14页 |
| ·Learners' depending on teachers | 第14-17页 |
| ·Learners' lack of learning strategies | 第14页 |
| ·Learners' lack of self-confidence | 第14-17页 |
| ·The ignorance of the role of learning tasks | 第17-19页 |
| ·The lack of meaningful learning tasks | 第17-18页 |
| ·The lack of mediating role of teachers in tasks | 第18-19页 |
| ·The ignorance of the role of learning contexts | 第19-23页 |
| 3 SOCIAL CONSTRUCTIVIST THEORY | 第23-40页 |
| ·Related theories | 第23-31页 |
| ·Behaviorist theory | 第23-26页 |
| ·Psycho-cognitive theory | 第26-29页 |
| ·Constructivist theory | 第29-31页 |
| ·Social constructivist theory | 第31-35页 |
| ·Social constructivist view of teachers | 第31-33页 |
| ·Social constructivist view of learners | 第33-34页 |
| ·Social constructivist view of tasks and contexts | 第34-35页 |
| ·Mediation Theory in language classrooms | 第35-40页 |
| 4 APPLICATION OF MEDIATION THEORY | 第40-66页 |
| ·Mediation Theory and teachers | 第40-54页 |
| ·Teachers as mediators in language classrooms | 第40-44页 |
| ·Key features of mediation and the application | 第44-49页 |
| ·Investigating mediation in language classrooms | 第49-54页 |
| ·Mediation Theory and learners | 第54-57页 |
| ·Mediation on how to learn | 第55-56页 |
| ·Teachers' encouragement for learners | 第56-57页 |
| ·Mediation Theory and learning tasks | 第57-64页 |
| ·Teachers' views of tasks in language teaching | 第57-62页 |
| ·Teachers' views of an educational perspective on tasks | 第62-64页 |
| ·Mediation Theory and learning contexts | 第64-66页 |
| 5 CONCLUSION | 第66-70页 |
| REFERENCES | 第70-75页 |
| APPENDIX | 第75-81页 |
