Realization of the Grapheme 'er' by Learners of English as Foreign Language The Case Study of Level One Students of English Department, University of Doba in Chad Journal title: International Journal of Trend in Scientific Research and Development Authors: Ndikoua Ngaidandi | Michael Etuge Apuge Subject(s): Biological Sciences, Computer and Information Science, Engineering, Mathematics, Agricultural Engineering, Management, Engineering, Multidisciplinary