  A third problem with the poverty of the stimulus argument is that  there has been little systematic attempt to provide empirical  evidence supporting its assertions about what the pld  contain. This is an old complaint (cf. Sampson 1989) which has  recently been renewed with some vigor by Pullum and Scholz 2002,  Scholz and Pullum 2002, and Sampson 2002. Pullum and Scholz provide evidence that, contrary to what Chomsky asserts in his discussion of  polar interrogatives, children can expect to encounter plenty of data that would alert them to the falsity of H1. Sampson  2002, mines the ‘British National Corpus/demographic,’ a 100 million word corpus of everyday British speech (available online at  http://info.ox.ac.uk/bnc/), for evidence that contrary to Kimball's  contention that complex auxiliaries are ‘vanishingly  rare,’ they in fact occur quite frequently (somewhere from once every 10,000 words to once every 70,000 words, or once every couple  of days to once a week).