The learning of affixes (prefixes and suffixes) by English as a Foreign Language (EFL) undergraduates is paramount since it enhances their vocabulary and helps them achieve fluency and proficiency in the English language. This paper aims to evaluate students’ command of affixes by using an electronic book (e-book) as a teaching method and examining students’ level of satisfaction regarding the learning of affixes through the e-book. The study employed a mixed-methods research design and included a sample of 50 first-year English for Communication students from Rajamangala University of Technology, Srivijaya. The research instruments used in this study included the pre-test, post-test, and an e-book satisfaction questionnaire, respectively. An interview was also used as a data-gathering tool in this research work. The findings indicated that the post-test results (26.40) yielded a superior outcome compared to the pre-test results (17.80). Furthermore, the e-book had an overall satisfaction rating of 4.57. In conclusion, the study found that students can significantly enhance their understanding of affixes, specifically prefixes and suffixes, by using unique e-books. For English teachers who encourage the use of e-books, the study's findings will have important implications since they will be able to use e-books for various uses in their respective classes when teaching EFL students.
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