1ContentsChinese Abstract...............................................................................2English Abstract................................................................................31. Introduction...................................................................................41.1 Background of the Study...............................................................................41.2 Purpose of the Study......................................................................................41.3 Significance of the Study...............................................................................52. Studies at Home and Abroad.......................................................52.1 Studies at Home.............................................................................................52.2 Studies Abroad...............................................................................................63. Theoretical Framework of Problem-Based Learning ( PBL)....73.1 Definition of PBL..........................................................................................73.2 Characteristics of PBL...................................................................................83.3 Role Transitions of Teachers and Students....................................................84. The Practice of Problem-Based Learning ( PBL ) in Junior Middle School English Teaching...................................................104.1 Pre-Class......................................................................................................114.2 In-Class........................................................................................................114.3 Post-Class....................................................................................................124.4 The Process of PBL Application..................................................................1224.5 Existin...
