title: How to create the negative of a sentence in nltk
body: <p>I am new to NLTK. I would like to create the negative of a sentence (which will usually be in the present tense). For example, is there a function to allow me to convert:
   'I run' to 'I do not run'</p>
  
  <p>or</p>
  
  <p>'She runs' to 'She does not run'.</p>
  
  <p>I suppose I could use POS to detect the verb and its preceding pronoun but I just wondered if there was a simpler built in function</p>