نبذة مختصرة : Although, written corrective feedback (hereafter referred to as CF) is applauded in many writing courses for fostering students’ quality writing, its impact on grammatical accuracy in L2 students’ writing remains a debated topic. Thus, this study looked into the effect of CF types on L2 students’ grammatical accuracy in writing. To achieve this objective, the design of this study was quasi-experiment. During the intervention of the study three groups: two experimental groups and one control group were participated with a total of 150 students. Over the intervention of 8 weeks, the students received pretest, immediate post-test and a delayed post-test was given. The data collected through the writing tests was analyzed using one-way ANOVA and Scheffe post hoc tests. The findings indicated that although CF types have positive effects during the immediate posttest scores, they did not have any positive effect on L2 students’ grammatical accuracy in writing context in the delayed posttest scores. This implies that CF alone is not sufficient for improving the grammatical accuracy of high school students in Ethiopia. Although the CF literature discussed its importance in the language acquisition, teachers are advised to focus on students’ additional exposures in writing accuracy rather than grammatical correction in their writing classes and use longer treatment to allow language learners’ engagement with the CF types provided.
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