title: Checking English Grammar with NLTK
body: <p>I'm starting to use the <a href="http://nltk.org/" rel="nofollow noreferrer">NLTK library</a>, and I want to check whether a sentence in English is correct or not.</p>
  
  <p>Example:</p>
  
  <p>"He see Bob" - not correct</p>
  
  <p>"He sees Bob" - correct</p>
  
  <p>I read <a href="http://www.ling.helsinki.fi/kit/2008s/clt231/nltk-0.9.5/doc/en/ch08.html" rel="nofollow noreferrer">this</a>, but it's quite hard for me. 
  I need an easier example.</p>