URLs for Liu’s Corpora-Based Grammar Instruction Project

http://corpus.byu.edu/bnc/x.asp (British National Corpus, 1980s-93, 100 million words)

http://corpus.byu.edu/time/x.asp (Time Magazine Corpus, 1920s to 2000, 100 million words)

http://quod.lib.umich.edu/m/micase (Michigan Corpus of Academic Spoken English, dates?, 1.8 million words)

http://www.americancorpus.org/ (Corpus of Contemporary American English, 1990-2011, 425 million words)