To be fair, Si doesn't pay for all such treats.
( ( To ( be fair ) ) ( , ( Si ( ( ( does n't ) ( pay ( for ( all ( such treats ) ) ) ) ) . ) ) ) )
(ROOT (S (S (VP (TO To) (VP (VB be) (ADJP (JJ fair))))) (, ,) (NP (NNP Si)) (VP (VBZ does) (RB n't) (VP (VB pay) (PP (IN for) (NP (DT all) (JJ such) (NN treats))))) (. .)))
Si pays for all treats.
( Si ( ( pays ( for ( all treats ) ) ) . ) )
(ROOT (S (NP (NNP Si)) (VP (VBZ pays) (SBAR (IN for) (S (NP (DT all)) (VP (VBZ treats))))) (. .)))