Acquiring correct second language pronunciation is an indispensable part of the language learning process. It plays a substantial role in enhancing the communicative competence and performance of second language learners. The learning of pronunciation is a very sensitive and complicated aspect of the English language classroom. However, all English language learners are not equally good in learning pronunciation. The aim of this research is to explore the factors which affect the pronunciation of English language learners. Theories, empirical evidence, and personal observations are discussed in this study which classifies the factors affecting pronunciation into two types, that is, inner and outer factors. Inner factors include age, brain, aptitude, types of learners and goals. Outer factors include first language interference, motivation, types of teachers and teaching methodologies, classroom environment, and institutional variables. This research is significant because it highlights the importance of acquiring pronunciation of the second language. Moreover, it provides an insight to language teachers and learners which allows them to critically understand the factors which affect the pronunciation of English as a second language as well as to reflect on their own learning and teaching methodologies. This research is qualitative and descriptive in nature. To support the arguments presented in this research, the researcher sought help form primary source books, personal observations and empirical studies, as well as secondary source research articles, journals and reviews. In conclusion, this study also gives some suggestions to teach pronunciation in the English language classroom.
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