The Effect of Passive Voice Writing Checklist on the Writing Task of Mathayom Suksa 4 Students

This classroom-based research aimed to enhance the writing skills of Grade 10 (Mathayom Suksa 4) students in an intermediate English class at Surawiwat School, Suranaree University of Technology.Initial writing assessments revealed recurring grammar errors, especially in the use of passive voice, despite students' familiarity with basic English grammar.The study hypothesized that integrating peer feedback with a passive voice grammar checklist could improve accuracy in writing.Students engaged in peer review using the checklist over three writing assignments.Results showed an increase in the number of students correctly using passive voice: from 58 students (70.73%) in the first task, to 64 (78.05%) and 71 (86.59%) in subsequent tasks.The mean writing score significantly improved from Task 1 to Task 2 (p = .001),though no significant differences were found between later tasks.The findings support the effectiveness of checklist-based peer feedback in improving grammatical accuracy.