IntroductionWith the number of English users worldwide likely reaching 2 billion (Crystal 2003), it is safe to say that the English language has achieved the status of a lingua franca world (Wardhaugh, 2006). The increase in language use has led to an increase in demand for English language courses (Nunan 2003). Therefore, this has also led to an increase in demand for English language teachers. These teachers can be either native speaking teachers (NST) or non-native speaking teachers (NNST). This paper aims to evaluate the effectiveness of the NNST on students' acquisition of the target language. In this essay, the NNST will be used to refer to someone for whom English is not their first language, but is a second or foreign language. Furthermore, the target language referred to in this essay is the English language. Another important point is that you will need to support your arguments by comparing NNST and NST. This essay will suggest that the NNST is as good as the NST when teaching in a monolingual ESL classroom. Model (learner vs. language) Many people think that NSTs are the best model because they speak the language naturally (Sahin 2005). According to Rampton (1996), NSTs who do not have teaching qualifications are more likely to be employed than NNSTs who are both qualified and experienced teachers of English as a foreign language (EFL). Students also generally seek out NSTs due to their natural fluency. However, it could be argued that speaking a language and teaching it are two separate issues. Medgyes (1999) distinguishes between the linguistic model and the learner model. Argues that NSTs are better language models, as learners may want to ... half of the article ...... Oxford University Press.Rampton, MBH (1996). Replacing the “native speaker”: Expertise, affiliation, and legacy. In T. Hedge & N. Whitney (Eds.), “Power, pedagogy, and practice” (pp. 9–22). Oxford: Oxford University Press.R. Terrance R. Boak and Rodney C. Conklin. The effect of teachers' interpersonal skill levels on high school students' achievement and anxiety American Educational Research Journal. vol. 12, no. 4 (Autumn, 1975), pp. 537-543Sahin, Ismet (2005). The effect of native English teachers on student attitudes and achievement. Journal of Speech and Language Studies, Vol.1, No.1Senel, M (2006). Tips for beautifying the pronunciation of EFL learners in Türkiye. Journal of Speech and Language Studies, Vol.2, No.1Wardhaugh, Ronald (2006). Introduction to sociolinguistics. Wiley-Blackwell