it ca n't help but engage an audience 
(ROOT (S (NP (PRP it)) (VP (MD ca) (RB n't) (VP (VB help) (CC but) (VP (VB engage) (NP (DT an) (NN audience)))))))
(ROOT (S (NP (PRP )) (VP (MD ) (RB ) (VP (VB ) (CC ) (VP (VB ) (NP (DT ) (NN )))))))