Using it to bolster an argument is plainly a mistake.
( ( Using ( it ( to ( bolster ( an argument ) ) ) ) ) ( ( ( is plainly ) ( a mistake ) ) . ) )
(ROOT (S (S (VP (VBG Using) (S (NP (PRP it)) (VP (TO to) (VP (VB bolster) (NP (DT an) (NN argument))))))) (VP (VBZ is) (ADVP (RB plainly)) (NP (DT a) (NN mistake))) (. .)))
I should not have used it to start and argument.
( I ( ( ( should not ) ( have ( ( used it ) ( to ( ( start and ) argument ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (MD should) (RB not) (VP (VB have) (VP (VBN used) (NP (PRP it)) (PP (TO to) (NP (NN start) (CC and) (NN argument)))))) (. .)))