▁form . ▁Therefore , ▁if ▁we ▁take ▁the ▁sentence ▁like : ▁ ▁Kate ▁was hes ▁the ▁car . ▁and ▁change ▁it ▁into ▁pass ive : ▁The ▁car ▁is ▁was hed ▁by ▁Kate . ▁we ▁can ▁notice ▁that ▁the ▁second ▁sentence ▁has ▁the ▁same ▁meaning ▁as ▁the ▁first ▁one . ▁They ▁differ ▁just ▁in ▁terms ▁of ▁style . ▁The ▁idea ▁of ▁transform ative ▁deriv ation ▁proves ▁that ▁K ury łow icz ▁was ▁ahead ▁of ▁his ▁times , ▁because ▁what ▁he ▁described ▁res emb les ▁one ▁of ▁the ▁main ▁assumptions ▁of ▁Ch om sky ’ s ▁Trans form ative ▁– ▁Gener ative ▁Gram mar ▁post ulated ▁several ▁years ▁later . ▁ ▁Foundation ▁concept ▁K ury łow icz ▁ ▁was ▁also ▁interested ▁in ▁the ▁element ▁hierarchy ▁and ▁the ▁function ▁of ▁the ▁language ▁system . ▁Anal yz ing ▁the ▁problem ▁of ▁hierarchy ▁he ▁introduced ▁the ▁concept ▁of ▁foundation , ▁which ▁is ▁the ▁relation ▁between ▁two ▁forms ▁or ▁functions ▁in ▁a ▁language . ▁One ▁of ▁the ▁forms ▁or ▁functions , ▁so - called ▁found ing , ▁always ▁results ▁in ▁the ▁presence ▁of ▁the ▁founded , ▁not ▁convers ely . ▁For ▁instance , ▁in ▁Latin , ▁the ▁end ings ▁- os ▁and ▁- or ▁in ▁the ▁nomin ative ▁singular ▁both ▁always ▁correspond ▁with ▁the ▁ending ▁- orem ▁in ▁the ▁accus ative ▁singular . ▁It ▁does ▁not ▁work ▁the ▁other ▁way ▁round ▁because ▁the ▁ending ▁in ▁the ▁accus ative ▁does ▁not ▁allow ▁one ▁to ▁predict ▁the ▁ending ▁in ▁the ▁nomin ative ▁case : ▁it ▁can ▁be ▁either ▁- os ▁or