    Sentence 1: In most cases, they dealt with words  and functional elements, creating what are  called reconstructions in hypothetical family  prototypes called, variously, Proto-Latin,  Proto-Greek, Proto-Germanic, Proto-Indo-         Iranian, and so forth, the ultimate goal being to  posit a single language called Proto-Indo-  European.    Sentence 2: They never attempted to reconstruct  hypothetical language prototypes.