This thesis is going to demonstrate the fossilized or fossilizing tendency in oral productions, to explore its underlying causes and to probe possible approaches to postpone or defossilize these phenomena in oral language training and teaching so that the overall level of oral competence for English learners can be further promoted. The thesis is going to demonstrate the fossilized or fossilizing tendency in oral productions, to explore its underlying causes and to probe possible approaches to postpone or defossilize these phenomena in oral language training and teaching so that the overall level of oral competence for English learners can be further promoted.