The present study is an attempt to investigate the frequency of different types of errors committed by EFL learners and the most prevalent types of errors, the types of corrective feedback do EFL teachers provide primarily in their classes and the students’ reaction followed by feedback, and the combination of corrective feedback and learner uptake leading to negotiation of form. To perform this study, an observational, analytical and descriptive study was conducted. For collecting data, six classes with 6 different instructors were chosen. The number of participants was 60 female students who were at intermediate level from two subsidiaries of Jahad Language Institutes in Karaj, Albourz Province. Homogeneous groups of language learners were selected. Each class was observed for 5 sessions and the interactions among students and instructors in different classes were recorded. The coding scheme was according to Lyster and Ranta’ (1997) model with some additional parts. Two other types of feedback were added, translation and multiple feedback. Also a combination of errors, multiple errors, was added. The analysis of the database showed that among five types of errors, i.e. phonological, grammatical, lexical, multiple errors and L1, the phonological and grammatical errors were committed primarily by students (43% and 30% respectively). From eight types of feedback given to learners, explicit feedback and recast were the most frequent types of feedback provided by the instructors. Finally, four types of feedbacks including elicitation, clarification request, metalinguistic feedback and repetition of errors led to student uptake: self repair and peer correction.