All right, so I might have found a solution that I feel okay with. I'm using what I've said, the word for 'tell', historically, to derive a modern particle of sorts that behaves virtually like an incorporated "noun" in the language, the development of which it ties in with.
The word's original sense would have been able to cover 'tell', 'count', 'retell', 'estimate' and the like.
So, in an earlier version the language, we might have had something like this.
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ha- um-awa | wa- um-aw-uk
tell-2- 3 | eat-2- 3- REL
The meaning here would have been something like "(re)tell it, that which you eat" = "tell me what you eat", and would have been an ever so increasingly common way of inquiring stuff, all while there would have been an older more IE-like system in existence, as the (eventually decreasing) standard one.
Somewhere in its post-stage, as the phrasing began to get more common, the object would start getting omitted from the imperative.
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ha- um | wa- um-aw-uk
tell-2 | eat-2- 3- REL
We then let time pass, and start moving on to an entirely new, no longer as intelligible variant of the language. A new era. The previous was Ancient Vanga and Post-Ancient Vanga, and we have now moved on to Old Vanga.
Attached enough to geminate the following consonant, we have now reached a point of more or less full integration. Skipping Middle Vanga and moving on to Modern Vanga, the variety of my interests, the metamorphosis is complete.
"What are you eating?"
Now, this gloss makes it look like a funky prefix, but watch, as the continuous form makes it get reänalysed along the way, making it pick up the same pattern as an incorporated noun – i.e. getting squeezed in between the progressive aspect prefix and the verb stem.
Ancient to Post-Ancient:
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ha- um-awa | a- wwa-um-aw-u
tell-2- 3 | PROG-eat-2- 3- REL
→
ha- um | a- wwa-um-aw-u
tell-2 | PROG-eat-2- 3- REL
Note how by the time of Old Vanga, the reänalysation is complete, and the a- has moved before the interrogative, and then carries on into Vanga:
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a- hhǫ- wwa-um-a-u
PROG-INT- eat-2- 3-REL
→
a- hhǫ-vva-m-ȯ
PROG-INT-eat-2-3
"What are you eating?"
Now, for some more dancing with word order, and to show that Vanga had more of a normal noun system once upon a time, let us derive another thing.
Consider the following AV example:
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luku | ha- um-awa | sal- w- ah | la-w-ah
place | tell-2- 3 | little-PL-3 | be-3-PL
The lack of any relativiser is ancestral to Vanga's modern complete lack of it, and even English works as a confirming example here: "tell me the place they are". No problem omitting one in English either.
In the post-stage, the object suffix has been removed again, but the noun had begun dropping out in such phrasing too. It had begun to become a fixed phrasing.
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ha- um | sal- w- ah | la-w-ah
tell-2 | little-PL-3 | be-3-PL
By the point of OV, the grammaticalisation of the interrogative, by then, affix was complete, and had been required to become consistently fixed to the predicate, making the word order change.
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hǫ- lla-w- a | ssall- ah
INT-be- PL-3 | little.PL-3
Not much of a change in the modern language:
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hǫ- ll- ȯ | ssall- ah
INT-be.PL-3 | little.PL-3
"Where are the children?"
As you can see, the hǫ- is now an interrogative with the meaning changing depending on the lexical sense of the verb to which it is applied. In cases of ambiguity, further verbs can be added in an auxiliary kind of way to clarify.
Yes/no questions will probably have no marking or change in word order, but just a change in intonation.
What do you think?