Research article (RA) is defined by Swales (1990) as a written text of a few thousand words, which reports some investigation by its author(s) and relates its findings to those of others. An RA is only considered finished if it is to appear or has appeared in a research journal or in an edited book. RAs in the past decades have become a “standard product of the knowledge-manufacturing industries” (Swales, 1990, 95). In 1990, Swales estimated that the total of published research articles yearly around five million, by 2019, this number was above 7 million (Fire & Guestrin, 2019). Corpus-based grammatical investigations of academic English were conducted by Biber et al. (1991). In their Longman grammar of spoken and written English a corpus-based approach to English grammar is presented and include five subcorpora, which form the basis of their grammatical investigations. Their academic prose subcorpus contains both extracts from books and research articles. For their 333 research articles “the total number of words is 2,676,800 and the average text length is 8,050 words” (ibid., 32), which makes this corpus large enough to draw generalizable conclusions from. In Chapters 6 to 9 of this book I will rely on much of their data and their analytical approach.