This thesis discusses a number of open questions and explores various understudied and unstudied aspects of Modern South Arabian (MSA) linguistics and MSA studies at large. Namely, it contains an extensive literature review which offers a summary of the most significant works in the field, a discussion about the internal sub-grouping and the internal cohesion of Modern South Arabian within Semitic, a grammatical sketch of the Jibbali/Shehret variety spoken on al-Ḥallāniyya island in the Kuria Muria Archipelago: this description focuses on the differences between this and the better-studied mainland varieties. The syntax section, however, takes into account not only the insular variety, but also central and eastern Jibbali/Shehret, in order...