Fragment of a discussion from User talk:CodeCat
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The sources I have derive it from Indo-European ḱo(m) and relate it to Old Irish con- and Germanic ga-. There are a lot of PIE forms we haven't added yet so that really isn't an indication for anything. The fact that there are two parts of speech doesn't matter either as the two have the same meaning so they are obviously related. I can't explain the Old Latin forms though. Maybe you are right and these are distinct words, but what evidence is there for that apart from Old Latin? To reconstruct a PIE term it would need to be attested in several branches.

CodeCat21:40, 31 July 2012

Could it be from the same PIE source, have split in Old Latin, and then have recombined in Classical Latin? It seems like pushing it, but I can't find a better way to explain away the ubiquitous qu- that only the conjunction has. Is there any closely related language with good enough attestation (I'm thinking Umbrian, Faliscan, etc)?

--Μετάknowledgediscuss/deeds23:13, 31 July 2012

If the conjunction quom means 'with' in Old Latin, then it has to be related to the preposition meaning the same. There is really no other way.

CodeCat23:20, 31 July 2012

But it doesn't. Maybe I wasn't clear; it only means "when", like the conjunction cum. The preposition cum was always spelt thus, as far as I can tell (I sifted through a few Latin text aggregators).

--Μετάknowledgediscuss/deeds23:25, 31 July 2012

Oh! I misread 'when' as 'with'! Yes, in that case they probably are different, and the conjunction derives from PIE *kʷóm. It would be a cognate of Germanic Template:termx.

CodeCat23:45, 31 July 2012

Could you please split the etymologies and rewrite as necessary, then? (I would do it myself, but I rather have someone who actually knows about PIE do it, if you don't mind.)

--Μετάknowledgediscuss/deeds00:14, 1 August 2012

Ok I've made the changes. How is this?

CodeCat00:25, 1 August 2012

Looks a lot better. Thanks so much!

--Μετάknowledgediscuss/deeds06:53, 1 August 2012

Curiosity drives me to ask then, how does LA quum / cum relate to quando? Is it quum + suffix -do, undergoing some kind of ablaut? -- Eiríkr Útlendi │ Tala við mig 16:28, 1 August 2012 (UTC)

Eiríkr Útlendi │ Tala við mig16:28, 1 August 2012

Doesn't the etymology of quando already explain that? I don't know where quam comes from, though. But cum and quam seem like the masculine and feminine accusative case forms of a pronoun, and are parallel to tum and tam. Their PIE forms would then be Template:termx, Template:termx, and Template:termx, Template:termx. Why the accusative is significant here I don't know, but it is certainly striking that these words have exact parallels in Gothic.

CodeCat16:38, 1 August 2012

Aha, yes, and that leads right to modern EN then / than, and modern DE wenn / wann, no? Interesting how the feminine a forms remain comparative / interrogative.

Eiríkr Útlendi │ Tala við mig17:05, 1 August 2012

Do any of you know if there's a reason for the questions beginning in qu- being answered by the same thing begiining in t-? (Actually, they're often non-answers; imagine the conversation "Qualis?" - "Talis.")

--Μετάknowledgediscuss/deeds17:12, 1 August 2012

More or less, yes. Those forms have actually been extended with a further suffix, of which the origin isn't known. The masculine accusative pronouns have an extra unidentified suffix. Gothic and Old Norse are the only Germanic languages that seem to have retained the unsuffixed forms, but only in their adverbial meaning. Compare 𐌸𐌰𐌽 ‎(þan, then) and 𐍈𐌰𐌽 ‎(ƕan, when) with the accusative pronoun forms 𐌸𐌰𐌽𐌰 ‎(þana) and 𐍈𐌰𐌽𐌰 ‎(ƕana). The Germanic languages also have no trace of any adverbs based on the feminine forms, like Latin has.

The difference between the -e- forms and -a- forms is not Germanic, but developed independently in Middle English and Middle or Modern German. It doesn't occur in any of the other languages, which use the same word for both.

There is no specific reason for the qu- and t- being parallel, it's just a matter of meaning. *kʷ- was the stem in PIE that was used to form interrogatives, while *t- was the stem used to form demonstratives. There were other stems in use for demonstratives too, but *t- was by far the most common and general in use.

CodeCat17:19, 1 August 2012