believe that people have lost the ability to think 
(ROOT (S (VP (VB believe) (SBAR (IN that) (S (NP (NNS people)) (VP (VBP have) (VP (VBN lost) (NP (DT the) (NN ability) (S (VP (TO to) (VP (VB think))))))))))))
(ROOT (S (VP (VB ) (SBAR (IN ) (S (NP (NNS )) (VP (VBP ) (VP (VBN ) (NP (DT ) (NN ) (S (VP (TO ) (VP (VB ))))))))))))