def desentencify(s):
    """
  Turns a string that looks like a sentence (initial capital letter,
  period at the end) into a phrase.  Fallible, but tries to be
  careful.
  """
    if len(s) >= 2 and s[0].isupper() and not s[1].isupper():
        s = s[0].lower() + s[1:]
    if s.endswith("."):
        return s[:-1]
    else:
        return s