Customers rarely inform the sales clerk in a typical retail store if a desired product is out of stock; they either buy a different product or leave the store without making a purchase.
( ( ( ( Customers ( rarely ( ( inform ( ( the ( sales clerk ) ) ( in ( a ( typical ( retail store ) ) ) ) ) ) ( if ( ( a ( desired product ) ) ( ( is out ) ( of stock ) ) ) ) ) ) ) ; ) ( they ( either ( ( ( buy ( a ( different product ) ) ) or ) ( ( leave ( the store ) ) ( without ( making ( a purchase ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNS Customers)) (ADVP (RB rarely)) (VP (VB inform) (NP (NP (DT the) (NNS sales) (NN clerk)) (PP (IN in) (NP (DT a) (JJ typical) (JJ retail) (NN store)))) (SBAR (IN if) (S (NP (DT a) (VBN desired) (NN product)) (VP (VBZ is) (ADVP (RB out)) (PP (IN of) (NP (NN stock)))))))) (: ;) (S (NP (PRP they)) (ADVP (RB either)) (VP (VP (VB buy) (NP (DT a) (JJ different) (NN product))) (CC or) (VP (VB leave) (NP (DT the) (NN store)) (PP (IN without) (S (VP (VBG making) (NP (DT a) (NN purchase)))))))) (. .)))
Customers will usually just buy something else, or leave the store entirely, if the item they want is not in stock.
( Customers ( ( ( will usually ) ( ( ( ( just ( buy ( something else ) ) ) , ) or ) ( ( ( ( leave ( the store ) ) entirely ) , ) ( if ( ( ( the item ) ( they want ) ) ( ( is not ) ( in stock ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Customers)) (VP (MD will) (ADVP (RB usually)) (VP (VP (ADVP (RB just)) (VB buy) (NP (NN something) (RB else))) (, ,) (CC or) (VP (VB leave) (NP (DT the) (NN store)) (ADVP (RB entirely)) (, ,) (SBAR (IN if) (S (NP (NP (DT the) (NN item)) (SBAR (S (NP (PRP they)) (VP (VBP want))))) (VP (VBZ is) (RB not) (PP (IN in) (NP (NN stock))))))))) (. .)))