The orientation that any research seeking to determine the real logical shape of the existential presuppositions accompanying the utterances of the type subject-predicate is shown. The result of this work, based on Frege, as starting point and preamble of Strawson´s analysis, must be considered an essential antecedent for any study seeking to examine the logico-semantic relations existing between the use of the language and the presuppositions that condition it.