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 always let a clerk know when an item is out of stock.
( Customers ( always ( ( let ( ( a clerk ) ( know ( when ( ( an item ) ( ( is out ) ( of stock ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NNS Customers)) (ADVP (RB always)) (VP (VBD let) (SBAR (S (NP (DT a) (NN clerk)) (VP (VBP know) (SBAR (WHADVP (WRB when)) (S (NP (DT an) (NN item)) (VP (VBZ is) (ADVP (RB out)) (PP (IN of) (NP (NN stock)))))))))) (. .)))