This study tried to find out what factors underline the characteristics of acquisition of English language in EFL classrooms. To this end, the Characteristics of English Language Acquisition Scale (ELAS) consisting of 41 items was designed by the researchers of this study and administered to 388 pre University Iranian EFL students at various private and public schools in Neyshabour and Zebarkhan. Factor analysis was run to determine the number of factors underlying the scale. The application of Principle Axis Factoring and rotating the extracted factors showed that the characteristics loaded acceptably on twelve factors underlying the learners’ EFL acquisition, i.e., learning boosters, facilitation, determination, voluntary, teaching methodology, affective factors, attitudes toward foreign speakers and their culture, learner engagement, adjustment, enhancement, teachers' output and individual differences. The results are discussed and suggestions are made for future research.

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