Abstract
This study compares the production of English diphthongs /eɪ/ and /oʊ/ between Korean learners of English (KLE) and English native speakers in terms of duration, F1 and F2. Four main results were found. First, durations of /eɪ/ and /oʊ/ by KLE are longer than the corresponding monophthongs /ɛ/ and /ɔ/, respectively, while /oʊ/ is as long as /ɔ/ for English native speakers. Second, Euclidean distance between two internal components of /eɪ/ is bigger than that between two internal components of /oʊ/ for KLE. Third, both Euclidean distances between the first component of /oʊ/ and /ɔ/ and between the second component of /oʊ/ and /ʊ/ are bigger compared to /eɪ/ for KLE. Fourth, the slopes of F1 and F2 relative to the duration of transition for /eɪ/ are steeper than those for /oʊ/ for KLE. The results suggest that KLEs more likely produce /eɪ/ as two separate vowels but /oʊ/ as a single vowel. These results will be discussed in light of loanword adaptation.
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