looking for astute observations and coming up blank 
(ROOT (S (VP (VP (VBG looking) (PP (IN for) (NP (JJ astute) (NNS observations)))) (CC and) (VP (VBG coming) (PRT (RP up)) (S (X (NN blank)))))))
(ROOT (S (VP (VP (VBG ) (PP (IN ) (NP (JJ ) (NNS )))) (CC ) (VP (VBG ) (PRT (RP )) (S (X (NN )))))))