Quote from that post:
This only shows definiteness when an object of a verb. You CAN'T use this as a subject.
^That just confirms what I'm saying here. In other words, the
-(r)a of Afghan Persian is the -
(r)o of Iranian Persian, not the -
é. There is no equivalent to -
é in Afghan Persian. It's a definite
object marker (را), not simply a definite marker (-
é).
Iranian
pesar-é "the known, familiar boy" can be both a subject and object (in which case it will take -
ro and become
pesaré-ro).
Afghan
pesar-a is only a definite object - it is the equivalent of Iranian
pesar-o, not pesar-é.
Furthermore, Afghan
pesar-a has the same stress as
pesar-o, which is on the penultimate syllable, while in
pesar-é the definite marker takes the stress. I'd already elaborated in another thread my opinion on the origin of the definite marker.
Looking at that given example:
Kitoba dari? do you have the book
It's equivalent to Iranian:
ketābo dāri? and formal کتاب را داری؟
as far as I know there’s no -o suffix acting as definite article marker, in Persian of any kind.
Not definite article, it's a
definite object marker. That's the role of را in modern Persian, both Iranian and Afghani.
Now, on to the issue of whether or not -
é is the definite article of colloquial Iranian Persian. First of all, can it be considered an article when it's a clitic? Second, is there a total correspondence between English "the" and Persian -
é?
Take this sentence: "Get in the car".
In colloquial Iranian Persian:
savār-e māšin šo.
As you can see,
māšin didn't take the -
é suffix. It
could, but then it would be referring to a specific, mentioned car familiar to both speaker and listener, not just a specific car that happens to be visible to both people (which the listener could have even been heretofore unaware of). In English, you cannot skimp out on the "the" here, while in Persian the -
é is optional to convey familiarity. This, I think, is the major functional difference between -
é and "the", and why I think -
é should rather be called a familiarity marker.