at heart is a sweet little girl 
(ROOT (SINV (PP (IN at) (NP (NN heart))) (VP (VBZ is)) (NP (DT a) (JJ sweet) (JJ little) (NN girl))))
(ROOT (SINV (PP (IN ) (NP (NN ))) (VP (VBZ )) (NP (DT ) (JJ ) (JJ ) (NN ))))