This paper is a presentation of the verbal morphology of the basic stems (Ga and Gb morphological classes) in a dialect of Jibbali/??r?t (Modern South Arabian sub-family, Semitic family) spoken in Eastern Dhofar (Sultanate of Oman). It aims, as far as possible, at an exhaustive description of the existing verbal types and its core is a collection of paradigms obtained through elicitation. Focus is given to the system of phonologically-triggered allomorphy that characterizes the Jibbali/??r?t (and Modern South Arabian) verbal morphology, whereby to a given inflectional cell correspond several morphological patterns the choice between which is determined by the characteristics of the root. Surface phonological processes necessary to an apprehension of verbal forms are also summarized.