The Analysis of the Mistakes in English Acquisition

English acquisition is a process of transition from native language to target language,in which a language system called inter-language in psycholinguistics will appear,which lies between the two languages.I focused on the analysis of the mistakes in the process and summarize them as three parts,Mother tongue interference.Over-generalization and simplication,all of which are inevitable manifestation in Inter-language and stages in English acquisition.I wish to find a better way to learning English by analyzing the cause of these mistakes.