Abstract Iranian students who learn English as a foreign language, make mistakes and errors in learning the skills of the new language. This paper tries to have a review of concepts and theories concerning error analysis and presents types of errors in which Iranian EFL Learners make. It focuses on error analysis and studies written errors through subcategorization frame in Iranian EFL learners in elementary and intermediate levels. Seventy students from different institutes were asked to translate some sentences into English. The aim of this study is to find out whether lack of L2 subcategorizational information will cause errors in production of L2 and if increasing proficiency level eliminates the errors. Findings of this study is supposed to confirm that lack of L2 subcategorizational information would be a major cause of errors which are highly affected by proficiency level.

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