In Sargaĺk, two is yor. 'Both' is either vrir or lyəs. Vrir takes a formally singular noun after it:
There are some complications: vrir does not distinguish the absolutive and pegative. For nominative or pegative nouns, it is always itself unmarked, but has the pegative singular marker on the main noun. For all other cases, the noun is in the singular case, and vrir takes the singular oblique case congruence:
vrir tame -ta both man pegative
Lyəs however, takes plural congruence with all cases and the main noun too is consistently plural. As subjects the verb for both of lyəs and vrir take plural congruence, except if vrir is used with certain words like 'hands', 'eyes', 'ears', 'nostrils', 'scissors' or 'the side of a boat'.
vri(r) -ə tame -rne both singular
both men to
Both of these can also be used as pronouns, much like English 'both'. They can also be used for a dual reflexive construction which can be used with any subject numbering two, regardless of morphological number.
The semantic difference lies in the extent to which the two referents are seen as separate units ('lyəs') or a concerted group ('vrir')
In Dairwueh, a cognate of vrir exists, ŋrəz. This particle has a few uses that have developed out of an original meaning of 'both': in NPs it goes before any number to mark 'all N of', but without any explicit number present it signifies 'both'. In numeral complements it serves to mark the number as that of a group, rather than as a number of independent individuals. This it also does with plural, indefinite determiners and pronouns, thus:
They are (a group of) six.
guni ŋrəz tirs are.3pl (both) six they are six
ŋrəz is the only 'numeral' in Dairwueh to take case. It roughly follows the plural paradigms:
they number six, there are six of them, (but as individual things)
guni tirs be.3pl six they are six
gen: ŋriŋa / ŋridin
loc-instr: ŋriŋa / ŋrider