A contrastive analysis may contribute for the establishment of reliable and compatible parameters among languages. Core always surpasses periphery and in the reality of languages one should not attain oneself to a first appearance. In our dissertation we have tried to show that behind one specific form there lies something much deeper and explicited in itself and that an apparent diversity is most of times illusory and of epiphenomenal nature, that is, this diversity stems from the interaction of fixed principles under slightly varying conditions. By means of a sample we propose to present the behavior and the coocurrence of demonstrative, possessive and attributive specifiers in the two languages, Portuguese and Arabic, as well as the role played by the determiner, the definite article, in the formation of a specific structure in the Arabic language named the IDaafa which needs no linking element such as the preposition but demands the compulsory use of the determiner, restrictions being respected thanks to the constitutive elements enrolled within the NP.