code: def complete_english(string):
      
      for x, y in [("dont", "don't"),
                  ("doesnt", "doesn't"),
                  ("wont", "won't"),
                  ("wasnt", "wasn't")]:
          string = string.replace(x, y)
      return string
docs: >>> complete_english('dont do this')
      "don't do this"
      >>> complete_english('doesnt is matched as well')
      "doesn't is matched as well"