title: Detect English verb tenses using NLTK
body: <p>I am looking for a way given an English text count verb phrases in it in past, present and future tenses. For now I am using <a href="http://www.nltk.org" rel="noreferrer">NLTK</a>, do a POS (Part-Of-Speech) tagging, and then count say 'VBD' to get past tenses. This is not accurate enough though, so I guess I need to go further and use chunking, then analyze VP-chunks for specific tense patterns. Is there anything existing that does that? Any further reading that might be helpful? The <a href="http://nltk.googlecode.com/svn/trunk/doc/book/ch07.html" rel="noreferrer">NLTK book</a> is focused mostly on NP-chunks, and I can find quite few info on VP-chunks.</p>