Discipline: Education
This study determined the sentence writing errors of the grade nine students at Dolores National High School, Magalang, Pampanga, Philippines. Total enumeration (70) of grade nine students served as the respondents of the study. The holistic sentence rubric, California Education Language and Development Test (CELDT), was used in analyzing the written sentences of the respondents. Statistical tools such as mean, frequency and ranking, and T-Test Independent Variable were used. The findings revealed that both in pretest and posttest, capitalization was the most persistent sentence error in mechanical category and wrong word choice in the structural category. However, the use of preposition was the most persistent error under the grammatical category for pretest only since tense/form of verb became the most persistent error in posttest. The grade nine students’ level of writing performance in pretest fell from emerging communication to basic communication in posttest after the conducted intervention. The respondents’ most persistent sentence error in pretest in each category had highly significant difference to their most persistent sentence error in posttest. It also revealed that the respondents’ scores in pretest had highly significant difference to their scores in posttest. The sentence writing module was strongly agreed by the validators with an overall mean of 4.65.