simply putters along looking for astute observations and coming up blank . 
(ROOT (S (ADVP (RB simply)) (VP (VBZ putters) (ADVP (RB along)) (S (VP (VP (VBG looking) (PP (IN for) (NP (JJ astute) (NNS observations)))) (CC and) (VP (VBG coming) (PRT (RP up)) (ADVP (RB blank)))))) (. .)))
(ROOT (S (ADVP (RB )) (VP (VBZ ) (ADVP (RB )) (S (VP (VP (VBG ) (PP (IN ) (NP (JJ ) (NNS )))) (CC ) (VP (VBG ) (PRT (RP )) (ADVP (RB )))))) (. )))