This study investigated intra-learner variation in the effects of implicit and explicit focus on form (FonF) on second language (L2) acquisition of the English passive, an interface construction. The study employed a pretest-posttest-delayed posttest design, with five treatment sessions between the pretest and posttests. Implicit FonF was operationalized as textual enhancement (TE), and explicit FonF as consciousness-raising (C-R). Five different outcome measures were utilized to examine the respective treatment effects on the form, meaning, and function of the passive. Data were collected with four Korean high school students, two engaging in TE and the other two in C-R, whose developmental routes through the experiment were analyzed quantitatively and qualitatively. The results of the analysis showed that implicit and explicit FonF led to differential variation within each learner, not only across the outcome measures but also over time, yet were suggestive of a potential benefits to each for the different domains encompassed in the passive. These results are further discussed in relation to the learners’ proficiency levels and the types of errors they produced.

This paper presents aspects of eight advanced Korean EFL speakers' acquisition of English unaccusative verbs over a period of five years. It examines how three factors−L1 morphology, pragmatic causation, and animacy−have affected their English unaccusative verb grammar during that time. A forced-elicitation grammaticality judgment task was performed three times over this period. It showed that L1 morphology was the most persistent among these factors. The results are compared with Chung (2014), a cross-sectional study, where the same method was used. The findings reveal that the Korean EFL subjects' overpassivization of English unaccusatives is not fossilized, which differs from the findings of Han (2006), who examined two Chinese native learners of English. It also indicates that instruction can play an important role in long-term L2 learning.

This study investigates variation in article use by Korean secondary school students of English. The study shows how two different tasks affect variation with respect to article types (a, the, and zero), proficiency level and the semantic feature, specificity. One task, a wide domain task, focused on grammar in general and the narrow domain task focused on articles. The statistical results showed that the subjects performed significantly better on the narrow domain task than on the wide domain task. The subjects showed significant differences among the three articles in the wide domain task, while they did not in the narrow domain task. The subjects performed significantly better with non-specific DPs (Determiner Phrases) than with specific DPs in the wide domain task, but reversed results were revealed in the narrow domain task. The present study presents some finding that grammatical domain plays a role as a variable for variability and shows that different tasks on the same research topic may produce different findings.

This study is a follow-up of Hwang's (2007) empirical study, which investigated the role of awareness in Korean high school students' subsequent learning of the English passive. Hwang (2007) found the positive relationship between awareness and subsequent processing of the target structure and claimed the crucial role of awareness in successful second language learning. The present study explores whether the effects of awareness retain six months after the first post-exposure task of Hwang (2007), which was performed one day after the instruction. The results of the present study revealed the retention of the effects of awareness in the written production task as well as in the multiple-choice recognition task. However, no significant differences were found between the passive group, who were consciously aware of the target structure through a reading text and brief explanation about the English passive, and the preposition group whose attention could be implicitly drawn to the target structure through the reading text only. The results cannot fully support Schmidt's noticing hypothesis and can also be interpreted as providing evidence for the dissociation claim that L2 learning can take place implicitly without conscious awareness.

This paper investigates Korean learners' comprehension pattern of English relative clauses. Also Korean learners' general principle for interpretation of English complex sentences as L2 is discussed. Though, for the native speakers' general principle, Conjoined-clause strategy, Left-to-Right strategy and Functional Principle are argued in linguistic literatures, none of them is fully supported by Korean learners' data. Thirty High School students and sixty college students were tested in the experimental tests. As the results of de Villiers et al.(1979), Korean adult learners have shown the order of comprehension, as SS > OO > OS > SO type, and the number of possible candidates of the gap in relative clauses, not just the distance, has made them difficult to comprehend. To see the distribution of the relative clauses in Korean textbooks, I have investigated two High School textbooks. Both the amount and the diversity of relative clause types seem not to reflect Korean learners' developmental process properly.