Abstract: This study employs corpus linguistic techniques to investigate how fourword lexical bundles are used in L2 untimed writing. It shows that most of the native speakers written bundles either have a low output rate or do not occur at all in L2 writing. Learners do use a number of highfrequency fourword exemplars in their writing; however, some of them are native speakers oral bundles and the majority are relatively infrequent in native speakers discourse. Given that learners bundle use deviates considerably from native speakers use, EFL teachers should attach importance to bundle instruction in which corpus evidence can be utilized.

Key words: lexical bundle, formulaic language, L2 writing, corpus linguistics

摘要： 运用语料库语言学技术考察二语非限时写作中四词词块的使用情况。结果显示：大多数本族语者笔语词块在二语写作中低频输出或零输出；学习者在写作中大量使用高频四词组合，但其中有些为本族语者口语词块，绝大部分则在本族语者语篇中相对低频。鉴于学习者与本族语者的词块产出水平差距较大，教师应重视词块教学，并可将语料库引入教学过程。

关键词: 词块, 程式语, 二语写作, 语料库语言学