The study examines how Business Schools at universities in Korea can motivate Korean, English as a foreign language (EFL) learners in business courses under the policy of English-medium instruction (EMI). This research focuses on the role of non-native English speaking teachers (NNESTs) and native English speaking teachers (NESTs) in an EFL environment. To conduct the experiment, EFL learners' motivation changes and qualitative interviews are collected; the NNEST class (n = 19), and NEST class (n = 18). The results of the motivation survey showed that at the beginning of the semester, the NNEST class learners displayed a lower level of confidence and intrinsic motivation than that of NEST class learners. However, by the end of the semester, while the intrinsic motivation levels remained the same, the NNEST class showed a higher level of confidence, interest, and extrinsic motivation than that of NEST class. Qualitative interviews were also done after the semester ended. The results of the interviews showed that motivation changes had no direct effect on classroom satisfaction in EFL contexts as learners understood the differences between NNESTs and NESTs, and their expectations in class of these two teachers were clearly different. Based on the findings, the paper also provides some policy advice to universities so as to help increase Korean EFL learners' motivation and class satisfaction under the English-medium instruction policy.

Recent developments in the acquisition of third languages (L3A) have only placed an emphasis on the influence of L1 or L2 on L3A (forward transfer). However, this study investigated the role of L1 or L3 in L2A (backward transfer), by focusing on cross-linguistic variations in generic interpretation on plural NPs. We examined how multilingual (L2 and L3) learners interpret nominals in generic contexts. Two experiments (an acceptability judgement task and a truth value judgement task) are conducted to investigate the influence of L1 and L3 on L2A (English) by third language (L3) learners. We looked at whether these learners exhibit backward transfer in the acquisition of generic NPs in English. The results of the two experiments suggest that the influence of L3 is more significant in L2A of English than that of L1. Therefore, in terms of backward transfer, the results are more supportive of the Foreign Language Effect which implies that cognitive similarities play an important role in L2A for L3 learners. In conclusion, for those multilinguals, it is important to factor the L3 (high foreignness) influence when acquiring L2 (high foreignness) because L3 transfer is more important than L1 (non-foreign) transfer.