The Impact of Focus on Form and Focus on Forms Instruction on Grammar Acquisition of the Subjunctive by Iranian Advanced EFL Learners

Grammar instruction is a crucial topic of debate in foreign language development. This study aimed at investigating the impact of focus on form (FonF) and focus on forms (FonFs) instruction on grammar acquisition of the subjunctive by Iranian advanced EFL learners. To this end, 40 Iranian advanced EFL learners were selected within the age range of 16-20 from a language school in Karaj, Iran. Initially, the Preliminary English Test was run to ensure that the students were homogenous with respect to their language proficiency. Before any treatment, a pretest was administered to determine the participants’ knowledge of the subjunctive. Afterwards, the researchers taught the subjunctive to one group through FonF instruction and the second group received FonFs instruction. After five weeks of instruction, the researchers administered a posttest to investigate the effectiveness of FonF and FonFs instruction. Then, paired samples statistics, the independent samples t-test, and Mann Whitney U test were run to test the null hypotheses. The findings revealed that although FonF and FonFs instruction have significant positive impacts on grammar acquisition of the subjunctive by Iranian advanced EFL learners, the students who were taught through FonFs instruction significantly outperformed the ones who received FonF instruction.