The null subject parameter holds significant implications for L1 transfer in language acquisition. English learners whose native language permits null subject sentences often exhibit a tendency to omit subjects in their English expressions (Tati, 2021). This research investigates whether Korean English as a Foreign Language (EFL) learners demonstrate a similar inclination toward using null subject sentences in their English writing. This inquiry is particularly pertinent as Korean, akin to Italian, Spanish, and Portuguese, is characterized by subject-drop features. Moreover, the study endeavors to elucidate the impact of the topic-prominence feature in Korean on the writing proficiency of Korean learners of English. To achieve these objectives, a thorough analysis was conducted on 20 compositions written by advanced EFL learners enrolled in an all-English University Program in South Korea. The error analysis revealed that 16 students consistently made subject-omission errors, with a pronounced frequency in subordinate clauses introduced by ‘because.’ Intriguingly, these learners also employed fragment ‘because’-clauses as a means to organize information in a topic-comment structure. This study contributes valuable insights into the manifestation of L1 transfer in the writing skills of Korean EFL learners and highlights the nuanced ways in which topic-prominence influences their English language performance.
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