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)))))) (. .)))
I want you to brand him with an iron.
( I ( ( want ( you ( to ( ( brand him ) ( with ( an iron ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP want) (S (NP (PRP you)) (VP (TO to) (VP (VB brand) (NP (PRP him)) (PP (IN with) (NP (DT an) (NN iron))))))) (. .)))