... An/ ∂n/ in front of vowel sound o. e, i, a, u and with alphabet A, E, F, H, I, L, M, N, O, R, S, X… Eg: an umbrella, an orange, an F A /an has an indefinite meaning ... to learners. Therefore, the study is carried out to find out these problems and help learners understand and use them more flexible. By pointing out the definition and types of ... The used articles, especially article a /an are rather a challenge for learners and for us also. Because of the complexities in using, article a /an may lead the misunderstanding and difficulties...