Analysis of Thai Students' Ability in Composing Using Indonesian Affixes in Southern Thailand
Abstract
This study aimed to analyze the ability of 30 fifth-grade Matayom students (equivalent to 11th grade high school) at Thamasat Whittaya School, Southern Thailand, to write essays using Indonesian affixes correctly, and to identify the most common types of affixation errors among them. Mastery of affixes (prefixes, suffixes, infixes, and confixes) is considered crucial because even the smallest error can affect the overall quality of the essay, which is rooted in meaning formation and grammatical accuracy. Using a descriptive qualitative approach, data were collected through writing tests, observations, and teacher interviews. The analysis showed that students' abilities were moderate, with a high tendency for errors focused on prefixes, suffixes, and confixes, particularly related to phonological changes and grammatical inaccuracies. Infix errors were the least common. These findings underscore the urgent need to strengthen morphology learning through explicit strategies, ongoing contextual practice, and the development of teaching materials relevant to the needs of Thai students.
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DOI: https://doi.org/10.31004/jele.v11i1.1848
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