本文采用Chafe(1986)言据分类模式,以英语语篇Yahoo!Answers为例来考察下列研究问题:如何在大型语料库中识别言据表达,如何判断言据复合表达的语篇功能,以及如何判断言据表达的可信性。研究发现,特定句法模式有助于言据的识别,而对于探索复合表达的功能和判断其可信性而言,语境是一个关键的因素。对上述问题的探讨有望帮助研究人员提高言据定量研究的准确性,同时,加深我们对言据表达的意义和功能的认识。 In this paper, we use the Chafe (1986) taxonomy model to investigate Yahoo! Answers as an example to examine the following research questions: how to identify the expression of speech in a large corpus, how to judge the textual function of compound expressions and how to judge The credibility of the expression The study finds that certain syntactic patterns contribute to the recognition of speech, and context is a key factor in exploring the function of compound expression and in determining its credibility. The discussion of the above questions is expected to help researchers to improve the accuracy of quantitative research of speech and at the same time deepen our understanding of the meaning and function of speech expression.