I want you to mark him.
( I ( ( want ( you ( to ( mark him ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP want) (S (NP (PRP you)) (VP (TO to) (VP (VB mark) (NP (PRP him)))))) (. .)))
He should be let free with no marks on him.
( He ( ( should ( be ( ( let ( free ( with ( no marks ) ) ) ) ( on him ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (MD should) (VP (VB be) (VP (VBN let) (ADVP (JJ free) (PP (IN with) (NP (DT no) (NNS marks)))) (PP (IN on) (NP (PRP him)))))) (. .)))