1. GloWbE =Corpus of global web‐based English. Brigham Young University.http://corpus.byu.edu/glowbe/
2. BNC=British National Corpus. (2010).http://corpus.byu.edu/bnc/-BNCweb(CQP‐Edition version 4.3 3/1/2010).
3. CED=Corpus of English Dialogues 1560–1760. (2006).Compiled under the supervision of Merja Kytö (Uppsala University) and Jonathan Culpeper (Lancaster University). Available in the Oxford Text Archive (http://ota.ahds.ac.uk).
4. ICAMET=Innsbruck Computer Archive of Machine‐Readable English Texts(ICAMET Prose and Letter Corpora). Available in the ICAME collection (clu.uni.no/icame/).
5. MEC=Middle English Compendium.University of Michigan.http://quod.lib.umich.edu/m/mec/