( You ( ( ( do n't ) ( need ( to ( capitalize ( proper names ) ) ) ) ) . ) )
(ROOT (S (NP (PRP You)) (VP (VBP do) (RB n't) (VP (VB need) (S (VP (TO to) (VP (VB capitalize) (NP (JJ proper) (NNS names))))))) (. .)))
You don't need to capitalize proper names.
(ROOT (S (SBAR (IN If) (S (NP (DT a) (NN unit)) (VP (VBZ is) (VP (VBN named) (PP (IN after) (NP (DT a) (NN person))))))) (NP (PRP it)) (VP (VBZ needs) (S (VP (TO to) (VP (VB be) (VP (VBN capitalized)))))) (. .)))