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First, you should review the basic grammar of English, and consolidate the logical relations in English.
Second, go to the bookshop and find out a good dictionary, such as Longman & Oxford, please note that, 【英汉双解学习型词典】is the best choice for Chinese learners. 我推荐：外研社. 《朗文当代高级英语词典（双解版）》。
Third, the last suggestion is that, you should often talk in English to native English speakers, to the best of your abilities.