: the widowmaker is a great yarn . 
(ROOT (S (: :) (NP (DT the) (NN widowmaker)) (VP (VBZ is) (NP (DT a) (JJ great) (NN yarn))) (. .)))
(ROOT (S (: ) (NP (DT ) (NN )) (VP (VBZ ) (NP (DT ) (JJ ) (NN ))) (. )))