they succeed merrily at their noble endeavor . 
(ROOT (S (NP (PRP they)) (VP (VBP succeed) (ADVP (RB merrily)) (PP (IN at) (NP (PRP$ their) (JJ noble) (NN endeavor)))) (. .)))
(ROOT (S (NP (PRP )) (VP (VBP ) (ADVP (RB )) (PP (IN ) (NP (PRP$ ) (JJ ) (NN )))) (. )))