This study was conducted to explore the individual uses of formulaic sequence (FS) frequency and their effects on complexity, accuracy, and fluency (CAF) in academic writing. Data was collected from the conclusion sections of a self-compiled corpus of 30 L2 master’s theses. Statistical analysis revealed several notable conclusions. 1) Student writers tend to make repetitive use of particular FSs in single texts. 2）FS use has a significant frequency effect on fluency, and the high-frequency group slightly outperforms the low-frequency group. 3) FS use has a certain frequency effect on accuracy, and the high-frequency group demonstrates the strongest correlation between FS frequency and accuracy. 4) FS use has a significant frequency effect on lexical complexity, and the low-frequency group slightly outperforms the high-frequency group. In the low-frequency group, FS use has a significant frequency effect on syntactic complexity as well. Finally, 5) The results support Skehan’s trade-off effect, a competition between CAF, which, to a certain degree, is affected by individual uses of FS frequency. The low-frequency group displays a greater trade-off effect than the high-frequency group.

中文翻译：

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公式序列对学术写作中CAF的频率影响：以L2硕士论文为例

进行这项研究的目的是探讨公式化序列（FS）频率的个体用法及其对学术写作中复杂性，准确性和流利性（CAF）的影响。数据收集自30篇L2硕士论文的自汇编语料库的结论部分。统计分析显示了几个值得注意的结论。1）学生作家倾向于在单个文本中重复使用特定的FS。2）FS使用对频率的影响很大，高频组略胜于低频组。3）FS的使用对频率有一定的频率影响，高频组显示FS频率与准确性之间最强的相关性。4）FS的使用对词的复杂性有明显的频率影响，低频组略胜于高频组。在低频组中，FS的使用也对语法复杂性具有重要的频率影响。最后，5）结果支持Skehan的权衡效应，即CAF之间的竞争，在一定程度上受FS频率的单独使用影响。低频组显示出比高频组更大的折衷效果。