Clare,
Have a look at CLAWS produced by UCREL at Lancaster University. More
details on our website:
http://www.comp.lancs.ac.uk/ucrel/claws/
The system has an error rate of only 1.5% within the 100M words of the
British National Corpus. You can submit a sample text via a web browser to
judge for yourself.
Regards,
Paul Rayson.
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