Measures of second language (L2) learners’ vocabulary size have been shown to correlate with language proficiency in reading, writing and listening skills, and vocabulary tests are sometimes used for placement purposes. However, the relation between learners’ vocabulary knowledge and their speaking skills has been less thoroughly investigated, and even less so in terms of pronunciation. In this article, we compare vocabulary and pronunciation measures for 25 Italian instructed learners of L2 French. We measure their receptive (Dialang score) and productive (vocd-D, MTLD) vocabulary size, and calculate the following pronunciation indices: acoustic distance and overlap of realizations for selected L2 French vowel pairs, ratings of nasality forratings of foreign-accentedness, fluency metrics. We find that vocabulary measures show low to medium correlations with fluency metrics and ratings of foreign-accentedness, but not with vowel metrics. We then turn our attention to the impact of research methods on the study of vocabulary and pronunciation. More specifically, we discuss the possibility that these results are due to pitfalls in vocabulary and pronunciation indices, such as the failure of Dialang to take into account the effect of L1-L2 cognates, and the lack of measures for evaluating consonants, intonation and perception skills.

中文翻译：

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关于发音技巧的词汇量告诉我们：评估二语学习者的问题

第二语言 (L2) 学习者词汇量的测量已被证明与阅读、写作和听力技能方面的语言能力相关，词汇测试有时用于安置目的。然而，学习者的词汇知识与口语技能之间的关系却很少被深入研究，在发音方面更是如此。在这篇文章中，我们比较了 25 名意大利语指导学习者的 L2 法语的词汇和发音测量。我们测量他们的接受（Dialang 分数）和生产（vocd-D，MTLD）词汇量，并计算以下发音指标：所选 L2 法语元音对的声学距离和实现重叠，鼻音等级外国口音，流利度指标的评级。我们发现词汇量度与流利度指标和外国口音评分的相关性为中低，但与元音指标无关。然后我们将注意力转向研究方法对词汇和发音研究的影响。更具体地说，我们讨论了这些结果可能是由于词汇和发音指标的缺陷造成的，例如 Dialang 未能考虑 L1-L2 同源词的影响，以及缺乏评估辅音、语调和感知的措施技能。