if it were a person , you 'd want to smash its face in 
(ROOT (S (SBAR (IN if) (S (NP (PRP it)) (VP (VBD were) (NP (DT a) (NN person))))) (, ,) (NP (PRP you)) (VP (MD 'd) (VP (VB want) (S (VP (TO to) (VP (VB smash) (NP (PRP$ its) (NN face)) (PP (IN in)))))))))
(ROOT (S (SBAR (IN ) (S (NP (PRP )) (VP (VBD ) (NP (DT ) (NN ))))) (, ) (NP (PRP )) (VP (MD ) (VP (VB ) (S (VP (TO ) (VP (VB ) (NP (PRP$ ) (NN )) (PP (IN )))))))))