Abstract:In modern society, the more frequent the international communication is, the more important it is to improve oral English competence. However, in English teaching, oral English is the most difficult and the weakest section. This thesis briefly introduces some famous theories on second language acquisition and systematically recites the various factors that contribute to the second language learning from the internal aspect and the external aspect. All these factors have great influence on language learning. Therefore, students can find some useful ways according to these factors to promote personal oral English development. This thesis will also analyze the feature of spoken English in comparison with written English and suggests some effective classroom methods that can be applied in class to help students improve their oral English.

Key Words: second language acquisition; communication competence; classroom teaching methods; non-English majors

摘要：在当今社会，国际间的交流越频繁，提高英语口语能力就越发的重要。可是，在英语教学中，口语是最困难、最薄弱的环节。该论文简要介绍了一些二语习得的著名理论，也从内因和外因两方面系统地阐述了影响二语习得的多方面的因素。所有这些因素都对语言的习得有着很大的影响。因此，学生们可以根据这些因素找到一些有效的方法，来促进个人口语能力的提高。该论文也分析了口语与书面语之间的差异，并提出一些能够运用于课堂上的有效方法来帮助学生提高他们的口语。

关键词：二语习得；交际能力；课堂教学方法；非英语专业学生

注：本文全文为英语所写的英语论文。只有摘要是中英语写的，全文为英文。