if you like peace , you 'll like promises . 
(ROOT (S (SBAR (IN if) (S (NP (PRP you)) (VP (VBP like) (NP (NN peace))))) (, ,) (NP (PRP you)) (VP (MD 'll) (VP (VB like) (NP (NNS promises)))) (. .)))
(ROOT (S (SBAR (IN ) (S (NP (PRP )) (VP (VBP ) (NP (NN ))))) (, ) (NP (PRP )) (VP (MD ) (VP (VB ) (NP (NNS )))) (. )))