title: Using NLTK and WordNet; how do I convert simple tense verb into its present, past or past participle form?
body: <p>Using NLTK and <a href="https://en.wikipedia.org/wiki/WordNet" rel="noreferrer">WordNet</a>, how do I convert simple tense verb into its present, past or past participle form?</p>
  
  <p><strong>For example:</strong></p>
  
  <p>I want to write a function which would give me verb in expected form as follows.</p>
  
  <pre><code>v = 'go'
  present = present_tense(v)
  print present # prints "going"
  
  past = past_tense(v)
  print past # prints "went"
  </code></pre>