to drag on for nearly three hours 
(ROOT (S (VP (TO to) (VP (VB drag) (PRT (RP on)) (PP (IN for) (NP (QP (RB nearly) (CD three)) (NNS hours)))))))
(ROOT (S (VP (TO ) (VP (VB ) (PRT (RP )) (PP (IN ) (NP (QP (RB ) (CD )) (NNS )))))))