return leftVerb || rightVerb || Language.treebank.isVerbTag(headWord.tag());
if (containsVerb == containsVerbUndefined) containsVerb = containsVerbRecursive() ? containsVerbTrue : containsVerbFalse; return containsVerb == containsVerbTrue;
  public boolean containsVerb() {    return leftVerb || rightVerb || Language.treebank.isVerbTag(headWord.tag());  }