Which Slavic language is the most archaic

[rashka]

Predicate very often at the end of a sentence like in Old Polish to start with. Kashubian is similar in this aspect.

Can you give an example of this?

[Lemon Kush]

Romanized?

They use the Roman alphabet

[Roy]

Can you give an example of this?

Kashubian

Gerard Labùda (1991) napisôł równak, że na Pòmòrzu utwòrzało są le jedno miono dlô zemi i lëdzy – Kaszëbë, Kaszuby. Ten autor pisze téż, że na pòrénk wãdrowa dësza kaszëbiznë (jãzëk i zwëk), a nie kaszëbsczi lëdze, chòc tak niejedni to zmiłkòwò òpisywają.


It is more like different word order than real constant difference (like often in German).

[Roy]

They use the Roman alphabet

This doesn't make any language more modern.

[Lemon Kush]

This doesn't make any language more modern.

But wasn't old Slavic using Cyrillic?

[rashka]

What I noticed is that there is so much overlap with each of the Slavic languages.
For example:
A town was bought/Towns were bought

1) Czech: město bylo koupeno/města byla koupena

2) Serbian: mesto je bilo kupljeno/mesta su bila kupljena
(mesto means place in Serbian, rather than town)
This was the passive past participle of the verb kupiti "to buy" in Serbian

[rashka]

Kashubian

Gerard Labùda (1991) napisôł równak, że na Pòmòrzu utwòrzało są le jedno miono dlô zemi i lëdzy – Kaszëbë, Kaszuby. Ten autor pisze téż, że na pòrénk wãdrowa dësza kaszëbiznë (jãzëk i zwëk), a nie kaszëbsczi lëdze, chòc tak niejedni to zmiłkòwò òpisywają.


It is more like different word order than real constant difference (like often in German).

All the Slavic languages have a free word order (SVO, SOV, VSO, VOS, OVS, OSV).
The overwhelming majority of the world's languages are either SVO or SOV.

[Permafrost]

Slovene and Lower Sorbian obviously, as they are the only Slavic languages to have retained the supine.

[arcticwolf]

Slovene and Lower Sorbian obviously, as they are the only Slavic languages to have retained the supine.

Excuse my ignorance bro, but what is that supine thing?

[Veneda]

Excuse my ignorance bro, but what is that supine thing?

I am curious, too