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 am glad that I decided to make the argument.
( I ( ( am ( glad ( that ( I ( decided ( to ( make ( the argument ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP am) (ADJP (JJ glad) (SBAR (IN that) (S (NP (PRP I)) (VP (VBD decided) (S (VP (TO to) (VP (VB make) (NP (DT the) (NN argument)))))))))) (. .)))