relying on the viewer to do most of the work 
(ROOT (S (VP (VBG relying) (PP (IN on) (NP (DT the) (NN viewer))) (S (VP (TO to) (VP (VB do) (NP (NP (JJS most)) (PP (IN of) (NP (DT the) (NN work))))))))))
(ROOT (S (VP (VBG ) (PP (IN ) (NP (DT ) (NN ))) (S (VP (TO ) (VP (VB ) (NP (NP (JJS )) (PP (IN ) (NP (DT ) (NN ))))))))))