Several recent works have shown the efficacy of written corrective feedback (WCF) as a method in improving ESL/EFL learners’ grammatical accuracy. Using a quasiexperimental design, this study aims at investigating the effect of metalinguistic explanation (ME) corrective feedback as a form focused instruction on Iranian high school students’ use of the hypothetical conditional in their writing. Fifty high school students were given the Oxford placement test. Based on the results, 34 of them were chosen to be homogenous in terms of language proficiency. The students were then randomly assigned to two groups, one experimental and one control group. The experimental group received the treatment (ME) after each guided writing practice but the control group did not. The results of independent samples t-test showed that students in the experimental group significantly outperformed students in the other group in the accurate use of the grammatical feature. The findings have some implicatio.....

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