Academia.edu has been sending me links to Bronze Age contact-languages, probably since showing interest in Hitto-Sumerian (with certain Akkado-Sumerian roots). Like this nine-year-old paper on Ugaritic-Hurrian, Hurro-Akkadian and Canaano-Akkadian
.
This evidence serves to show how a foreigner would sound out another language phonetically. It also might illustrate the spread of languages across diplomatic and trade networks. How might languages accumulate loanwords in which direction?
The best paper in my opinion is still Petra Goedegebuure's 2008 paper on The Luwian substrate of Hattian
. Many ancient languages are VSO (Semitic) or SOV. Among SOV were protoBaltic and Indo-Iranian (and German!); which all should point to Aryo-Baltic being SOV, and in those ancient times Mitannic Aryan. Italic and Anatolian also trended SOV suggesting this for the whole of protoIndoHittite.
It happens that paraSemitic Akkadian wasn't VSO; it was SOV or even OSV like Yoda. This is ascribed to Sumerian being SOV. The same has happened to fully-Semitic Amharic, following Cushitic as SOV. Apparently late Byzantine Greek returned to SOV not under Anatolian / Persian / Latin influence, as you'd think, but Turkish. (Boo!)
Once hattili was identified in the Hattusa archive, scholars have painstakingly identified its nouns and verbs based on bilinguals and whatever words in Hittite can be flagged as parallel. Goedegebuure p.146 notes that Melchert and Soysal in 2003-4 could count under thirty loanwords from Hattic into Hittite, total. The Hittites, who were ancestrally Nesians occupying Hattic cities like Hattus (and Sapinuwa and Nerik), fossilised Hattic, rather, into the civic rituals of Hattus and Nerik. It happens Hittites recorded that Hattus was, uh, cursed; by its conquerors, Pithana and Anitta. So those who were squatting in that city perhaps felt they needed to propitate its gods. The Kanesh-origin Anatolian Hittites didn't alter their own grammar to be more Hattic.
Oddly there's an exception to that: KBo 18.151. This is an Old Hittite ritual - and may even deserve to be called "Old Hittite" against nesili. Its grammar is atypical of Old Nesian. It looks more like Hattic should be. But were KBo 18.151 a mere translation, the archive should hold the original; and where translations do exist elsewhere, they're in pure Nesian. Soysal in 2000 argued that KBo 18.151 preserves the Anatolian Hittite dialect spoken around Hattusa by non-Nesians. After the conquest from Kanesh / Nesa, the "proper" language was imposed.
This works in reverse as well. If any Anatolian ever crept into Hattic ritual, the pious Hittites tried to purge such like modern Greeks refuse Turkish.
Hattic sentences for their part were caught, by the scribes, on the way between VSO and SOV. Goedegebuure notes that Hattic is a prefixing language. So the verb came first; Hattic was being forced into SOV. (Is Semitic prefixing? I suppose those taf'îl, mufa''al, and maf'ûl nouns, and the han- and al- definitive-articles; but those seem late, and we can point to suffixes, like Aramaic's emphatic-state. Although Aramaic had influence from late-stage Akkadian.)
All this should aid in telling the most vexing problem of Hattic: if it has any relation to other languages, as VSO not being IndoHittite nor Sumerian itself (nor Cushitic obviously). But it also is hardly Semitic. Causasian, Hurrian, Kaska...?