This study attempts a detailed discussion of the phenomenon of I’rab (conjugation) between linguistic conventions and relations of proximity through three levels: I’rab and linguistic conventions, I’rab and normative linguistic interaction, and I’rab and the task of communication and expression. The paper argues that the phenomenon of I’rab is related to the two poles of clarification and revelation—clarifying the phonetic signs and revealing the linguistic conventions—in order to fulfill the “manifest” and the “immanent” needs of the speaker, in accordance with the traditions and norms that govern the laws of linguistic communication between this speaker and the listener. The I’rab phenomenon has become rooted in the Arabic language, which means that it did not content to stay faithful to the origins, but went beyond that to investigate the codes of speech by referring phonetics to laws and purposes; thus, the Arabic language is proof of the academic theory that is based on the duality of the conjugated language and the mental structure. In order to employ it in a manner that best serves the Arabic language and its future prospects, this study argues that the I’rab phenomenon is specific to the Arabic language par excellence and that it is not only in need of further investigation, but also a rethinking.