Abstract: This research aims to identify students’ usage and challenges of English grammar conventions and vocabulary knowledge in writing recount text. It applied a descriptive qualitative design. The participants were 53 eleventh-grade students from SMKN in Bogor, and they were gained through purposive sampling. Data were collected through students’ writing, questionnaires, and interviews. The data were analyzed using the qualitative data analysis model consisting of data condensation, data display, and conclusion drawing. The result of this research showed that 44.52% of students are able to apply the usage of English grammar conventions in writing recount text appropriately, 55.5% faced problems. Then, 39.6% of students were able to apply the usage of vocabulary knowledge appropriately, and 60.4% faced problems. The research concludes that grammar mastery and vocabulary knowledge significantly influence students’ ability to write recount texts. Therefore, English teachers are encouraged to provide more focused instruction and practice. Keywords: Usage; Challenges; Grammar Conventions; Vocabulary.
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