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Eva Betty Simanjuntak; Amanda Daniela Naibaho; Citra Suci Ramadani; Fitri Sibarani; Rahma Puspita; Ratika Rahmi; Michael Sitorus. Analysis of Elementary School Students’ Difficulties in Mastering Basic English Sentence Structure: On To Be, Verbs, Adverbs, Nouns, Subject Pronouns and Possessive Adjectives: Penelitian. JERKIN 2025, 3, 4028-4031.