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Recent empirical findings in the field of Multilingualism have shown that the mental lexicon of a language learner does not consist of separate entities, but rather of an intertwined system where languages can interact with each other (e.g. Cenoz, 2013; Szubko-Sitarek, 2015). Accordingly, multilingual language learners have been considered differently to second language learners in a growing number of studies, however studies on the variation in learners' vocabulary size both in the L2 and L3 and the effect of cognates on the target languages have been relatively scarce. This paper, therefore, investigates the impact of prior lexical knowledge on additional language learning in the case of Hungarian native speakers, who use Romanian (a Romance language) as a second language (L2) and learn English as an L3. The study employs an adapted version of the widely used Vocabulary Size Test (Nation & Beglar, 2007), the Romanian Vocabulary Size Test (based on the Romanian Frequency List; Szabo, 2015) and a Hungarian test (based on a Hungarian frequency list; Varadi, 2002) in order to measure vocabulary sizes, cognate knowledge and response times in these languages. The findings, complemented by a self-rating language background questionnaire, indicate a strong link between Romanian and English lexical proficiency.

This study provided a novel flipped classroom model with a detailed combination of in-class and out-of-class activities to teach a Vietnamese-English Translation module. The study aimed to (1) provide an in-depth insight into how the model was actually implemented in a specific scenario to make the teaching-learning process more interesting and meaningful, and (2) investigate the effectiveness of the flipped classroom model towards learners’ translation performance through various assessments. 39 English-majored juniors at Banking University of Ho Chi Minh City, Vietnam participated in the study during the second semester of the 2018-2019 academic year. The study implemented a case-study mixed method design, applying assessment analysis and content analysis of one specific learning scenario to clarify how the flipped learning model contributed to the training process. Results show that a careful design of the flipped model contributed to the relevant literature on how to implement flipped learning in actual classroom settings, but also effectively improved learners’ performance in translation studies.

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Study one and a paper on the relationship between academic success and vocabulary size are in preparationThe chapters of this thesis are more detailed versions of the published papers. The publications should be used for page references and citations.