Similar to Semitic language, a very large amount of Berber verbs have three root consonants. This made it incredibly easy to integrate the basic Semitic verb stem from Arabic into its own system, which many Berber language have therefore also done.
But besides three-consonantal there are many verbs that have only one or two obviously present root consonants. Inspired by Semitic reconstruction, it has been assumed that these 1- or 2-consonantal roots are 'weak' roots, that have lost an ancient consonant. With recent discoveries, it has been shown that this is certainly true for a large group of these verbs, which originally contain *ʔ or *β, of which reflexes can still be found in some Berber languages. But there are some some roots where this original weak consonant is less obvious.
One of the verbal groups that may have a lost radical is the roots of this first apophonic class (henceforth A1 roots)that we discussed in the last blogpost, which have a long initial consonant, in the place where 'sound' A1 roots have two consonants, compare the paradigms of *ălmŭd 'to learn' (which is a very early loan from Punic, or Hebrew) and *ăkkŭs 'to take away'
aor. *ălmŭd ~ *ăkkŭs
pf. *ŭlmăd ~ *ŭkkăs
impf. *əlămmăd ~ *ətăkkăs
Already we detect an interesting difference between the two verb types. Rather than the expected **əkăkkăs which you might expect if the long *kk was simply the result of the first and the second root consonant being identical, it seems like this long consonant cannot be broken up. Instead a 'dummy' consonant t is inserted to retain the əCăCCăC pattern.
But the situation becomes even more confusing when we get to the causative forms. From the verbs with an initial long vowel (from an original *h?) we were able to deduce that the causative vocalisation was ës-ïCCëC, compare the following Tuareg forms:
*s-əlməd 'to teach' ~ *s-igəm 'to cause to pull water from a well' ~ *s-ukəs 'to cause to take away'
As we can see, for some reason the long consonant kk has been shortened, and a vowel *u shows up in the place where we would expect a *ï. It has been proposed, and Prasse follows this proposal, that the original initial consonant of these types of roots was a *w, this idea is not unreasonable, but the exact reconstruction is actually quite difficult to determine. Let's assume that this hypothesis is correct, the Proto-Berber forms would then look as follows:
aor. *ăwkŭs
pf. *ŭwkăs
impf. *əwăkkăs
impf. neg. *əwĭkkĭs
caus. *əsĭwkəs
First we must assume assimilatory rules *ăwC > ăCC and *ŭwC > ŭCC. This is reasonable.But note that we must assume that the assimilation did not happen in the sequence *ĭwC, which must have yielded *uC. I find it difficult to justify, phonetically that *ŭwC yielded *ŭCC and *ĭwC yielded *uC. I would sooner expect it the other way around.
There are other problems: now that we reconstruct a third consonant *w, it is actually a lot more difficult to argue why the imperfective formation would use the *t- element.
We must think of some kind of reason why *w was not allowed to be the onset of a syllable, which is hard to argue when you have deictic elements like *wa and *wi which can probably reconstructed for Proto-Berber.
An ad-hoc soundlaw *əwă > *ă may solve this. This would yield **ăkkăs for the imperfective, then perhaps to reinstate the əCăCCăC syllable structure, the *t element was added, to then yield *ətăkkăs, but there is absolutely no basis to assume such a sound law except to explain this one verb form, which is unsatisfying. This explanation, however is attractive on one point. If we would reconstruction impf. *ətăwkăs neg. impf. *ətĭwkĭs we would have serious difficulty explaining why *ətĭwkĭs yields təkkəs in Tuareg and not **tukəs, as we find in in the causative *əsĭwkəs > sukəs.
It also is not particularly plausible that *əwă would lose intervocalic *w while other instances of intervocalic *w would be retained For example *awŭy (= *ăhwŭy?) 'to carry'
While this explanation works out somewhat elegantly, we've mostly moved the problems into a realm of internal reconstruction, which cannot be falsified at all. Moreover, the sound laws that are needed to get these forms are not particularly plausible, phonetically.
The next issue we'll discuss will be the probably with *h initial verbs, and whether we should really reconstruct a radical *h for Proto-Berber, or simply a long vowel.
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