Abstract
T his study aimed to find out grammatical errors in writing personal letter and the most grammatical errors made by the eleventh graders of SMA Negeri 5 Ogan Komering Ilir . This study used descriptive qualitative research method. The subject of the study was the eleventh social one students of SMA Negeri 5 Ogan Komering Ilir in the academic year of 2020/2021. The technique of collecting the data were a writing test using google form . To check the validity and reliability of the test, a triangulation method was applied . The information was presented in a descriptive manner and assessed using a percentage calculation. T he calculations presented that the students made 12.5% sentence pattern errors, 24.1% tense errors, 9.17% pronoun errors, 2.5% preposition errors, 20% punctuation errors, and 31.66% spelling errors.The most dominant of grammatical errors made by students was error of spelling (31.66%).
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