leave fans clamoring for another ride 
(ROOT (S (VP (VB leave) (S (NP (NNS fans)) (VP (VBG clamoring) (PP (IN for) (NP (DT another) (NN ride))))))))
(ROOT (S (VP (VB ) (S (NP (NNS )) (VP (VBG ) (PP (IN ) (NP (DT ) (NN ))))))))