once folks started hanging out at the barbershop , they never wanted to leave . 
(ROOT (S (SBAR (IN once) (S (NP (NNS folks)) (VP (VBD started) (S (VP (VBG hanging) (PRT (RP out)) (PP (IN at) (NP (DT the) (NN barbershop)))))))) (, ,) (NP (PRP they)) (ADVP (RB never)) (VP (VBD wanted) (S (VP (TO to) (VP (VB leave))))) (. .)))
(ROOT (S (SBAR (IN ) (S (NP (NNS )) (VP (VBD ) (S (VP (VBG ) (PRT (RP )) (PP (IN ) (NP (DT ) (NN )))))))) (, ) (NP (PRP )) (ADVP (RB )) (VP (VBD ) (S (VP (TO ) (VP (VB ))))) (. )))