that 's what i liked about it 
(ROOT (S (NP (DT that)) (VP (VBZ 's) (SBAR (WHNP (WP what)) (S (NP (PRP i)) (VP (VBD liked) (PP (IN about) (NP (PRP it)))))))))
(ROOT (S (NP (DT )) (VP (VBZ ) (SBAR (WHNP (WP )) (S (NP (PRP )) (VP (VBD ) (PP (IN ) (NP (PRP )))))))))