So today I'll discuss the dual somewhat. Many of the issues found in the Plural are also found in the Dual.
The most common reconstruction of the Dual is as follows:
The Canaanite languages only retain the Gen.-Acc form with an *m as the final consonant, just like the plural. Ugaritic actually retains both caseforms, and surprisingly the nunation suffix is found both with suffix *mi and *ma. This is probably due to analogy from the *ma found in the plural.
This means that Huenergard's hypothesis that *ni is a dissimilation after *ā from *na in Arabic can't be right, as Ugaritic seems to show and *i too.
It is interesting to note that, although Akkadian lost every indication of *-na in the plural, the dual nunation *-ni is retained. The Akkadian dual endings are Nom. -ān Gen-Acc. -īn. Yet just like The plural is invariable, as is the dual. So there has been an analogical leveling both in the plural and in the dual which made the function of Nunation get lost in the Plural and Dual of Akkadian. The plural generalised the form without nunation while the dual generalised the form with nunation.
The next part of this series will be a short discussion on the He Locale in Hebrew and how it relates to other Semitic languages.