1. CEN = The Corpus of English Novels . Compiled by Hendrik De Smet . See < https://perswww.kuleuven.be/~u0044428/cen.htm >
2. CLMET3.0 = The Corpus of Late Modern English Texts, Version 3.0 (CLMET3.0) . Created by Hendrik De Smet , Hans-Jürgen Diller & Jukka Tyrkkö . See < https://perswww.kuleuven.be/~u0044428/clmet3_0.htm >
3. COCA = The Corpus of Contemporary American English: 560 Million Words, 1990 – present . 2008– . Compiled by Mark Davies . Available online at < https://corpus.byu.edu/coca/ >