Hello every body .Could you give me some advisement about learn English

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Hello every body,I come form Shanghai.I am learning English in current.I am trying to remember the English words endeavour.However ,When I say someting to my teacher,She doesn't understand what I said.It is unbelieveble that my English is so bad.I am confused now..Could you give me some issuesuggestion to improve the Langguage.Thank you for your help~~