Can sort shapes into categories.
( ( Can sort ) ( ( shapes ( into categories ) ) . ) )
(ROOT (S (NP (JJ Can) (NN sort)) (VP (VBZ shapes) (PP (IN into) (NP (NNS categories)))) (. .)))
Impossible to sort shapes.
( Impossible ( ( to ( sort shapes ) ) . ) )
(ROOT (FRAG (ADJP (JJ Impossible)) (S (VP (TO to) (VP (VB sort) (NP (NNS shapes))))) (. .)))