title: Python NLTK pos_tag not returning the correct part-of-speech tag
body: <p>Having this:</p>
  
  <pre><code>text = word_tokenize("The quick brown fox jumps over the lazy dog")
  </code></pre>
  
  <p>And running:</p>
  
  <pre><code>nltk.pos_tag(text)
  </code></pre>
  
  <p>I get:</p>
  
  <pre><code>[('The', 'DT'), ('quick', 'NN'), ('brown', 'NN'), ('fox', 'NN'), ('jumps', 'NNS'), ('over', 'IN'), ('the', 'DT'), ('lazy', 'NN'), ('dog', 'NN')]
  </code></pre>
  
  <p>This is incorrect. The tags for <code>quick brown lazy</code> in the sentence should be:</p>
  
  <pre><code>('quick', 'JJ'), ('brown', 'JJ') , ('lazy', 'JJ')
  </code></pre>
  
  <p>Testing this through their <a href="http://nlp.stanford.edu:8080/corenlp/process">online tool</a> gives the same result; <code>quick</code>, <code>brown</code> and <code>fox</code> should be adjectives not nouns.</p>