Researches and studies of discourse analysis have been thick and fast both domestically and internationally. Halliday points out that the aim of Systemic Functional Grammar has been to construct a grammar for purposes of text analysis: one that would make it possible to say sensible and useful things about any text, spoken or written, in modern English. Therefore, Systemic Functional Grammar has been widely used to analyze discourses of various fields, for example, science and technology, law, novels, poems, advertisements and English idioms, etc. However, as far as the author of this book...