Why don't you just throw away the tags? I don't know what format the tagged
corpus is in, but it should not be too difficult to remove the tags using
your favourite text processing tool (sed/awk/perl/...).
Regards,
Oliver Mason
-- Computer Officer | Corpus Research | School of English | The University of Birmingham | United Kingdom | O.Mason@bham.ac.uk | phone +44-(0)121-414-6206 fax +44-(0)121-414-3288 | http://www-clg.bham.ac.uk | formerly Oliver Jakobs