Languages have formulaic multiword sequences (MWSs) which occur repeatedly in speech and writing (e.g., Nattinger & DeCarrico, 1992; Siyanova-Chanturia & Pellicer-Sanchez, 2018). For learners, then, the production of MWSs is an important element in developing spoken language that is complex, accurate, and fluent. Though the use of MWSs is important for achieving spoken proficiency, it is unclear whether the production of MWSs supports or hinders another aspect of proficiency, lexical variety. This paper is an exploration of the production of MWSs (recurrent trigrams) and the development of lexical variety, found in two-minute speeches (n = 294) from English L2 learners (n = 66) over time in an intensive English program (IEP). Using hierarchical linear modeling and correlation analysis, we found different patterns of development for the two measures. The use of MWSs increased and then decreased while the lexical variety scores slightly decreased and then sharply increased over time in the IEP. Although the impact of MWSs on oral fluency has been studied, this seems to be the first study to consider how MWSs influence lexical variety across development.

语言具有公式化的多单词序列（MWS），在讲话和写作中反复出现（例如，Nattinger和DeCarrico，1992； Siyanova-Chanturia和Pellicer-Sanchez，2018）。因此，对于学习者而言，MWS的产生是开发复杂，准确且流利的口语的重要因素。尽管MWS的使用对于提高口语水平很重要，但尚不清楚MWS的产生是否支持或阻碍熟练程度的另一个方面，即词汇多样性。本文是对英语二语学习者（n = 294）的两分钟演讲（n = 294）中MWS（递归三元组）的产生和词汇变体的发展的探索。= 66）随着时间的流逝在强化英语课程（IEP）中。使用分层线性建模和相关分析，我们发现了这两种方法的不同开发模式。在IEP中，随着时间的流逝，MWS的使用先增加后减少，而词汇多样性分数则先降低然后急剧增加。尽管已经研究了MWS对口语流利性的影响，但这似乎是第一个考虑MWS如何在整个开发过程中影响词汇多样性的研究。