title: How to get Coarse-grained Part of Speech Tags?
body: <p>I have a data set which is annotated by Collins parser. Right now, I am keeping the POS of each word in the data set as a feature. The problem is that I don't need fine-grained POS. So, I have combined some of the tags. For example, I assume all VBD,VBP,VBZ,VBG under the category of "Verb". And for nouns, I assume NNP and NNS as "Noun" category.</p>
  
  <p>So, here is the list of POS tags that I have after doing all combinations:</p>
  
  <blockquote>
    <p>VB, NN, TO, JJ, IN, EX, RB, WP, PRP, MD, UH, WRB, WDT, RP, CD, POS, DT, PRP$, WP$, CC, RBR</p>
  </blockquote>
  
  <p>Now, my question is where can I find a list of coarse-grained POS tags? Is there any standard coarse-grained POS tag list?</p>
  
  <p>In my system, If I don't combine other POS tags, I can get better results. I am wondering if I am allowed to keep my current list? Or should I combine them as well?</p>
  
  <p>Thanks in advance,</p>