These all contribute to the language learners to achieve good results in language learning。 Interactive theory can well explain how to practice your spoken language by group learning。 It can improve your oral English because repetition, analysis, correctness, adjustment and simplification can make it easier to understand the input language。 

2。2 Recent development area theory

Development theory stems from the study of children’s psychology and children’s education。 Its basic assumption is children interact with the right things can promote their grasp of important concepts and children’s cognitive development and social development is developed through peer interaction。 

Former Soviet educator Vygotsky said that the function is first formed in the form of a child-to-child relationship and then become the inpidual’s psychological function- studies show that reflection comes from arguing( Vygotsky 99-108)。 In other words, people’s psychological function develops in the progress of mutual communication。