Classical Armenian

քառ (kʻaṙ) նոյն (noyn) < *no-ēn (adverbial suffix) *h₁nó-eyni- ("over there" +"that") The pluralization suffix -k', which since Old Armenian was used form the nominative plural, could be linked to the final -s in PIE *tréyes > Old Armenian երեք (erekʻ) and չորք (čʻorkʻ), which then can point to a pre-Armenian *kʷtwr̥s (< *kʷetwóres).

In the second and third person singular of the present, the pluralization suffix -k' can be noticed again instead of the final part of the original PIE ending.

Nouns can show more than one model of conjugation and retain all cases from PIE except for the vocative, which merged with the nominative and the accusative.

The o-type model shows an extremely simplified paradigm with many instances of syncretism and the constant use of the pluralization suffix -k' in the plural; not only do strong cases tend to converge in the singular, but most of the weak cases converge into -oy, perhaps from the PIE dative *-oey.

երկարօք (erkarōkʻ) < *dweh₂róysu The adjective "long" shows the same sound changes of the numeral "two": PIE *dweh₂rós / *dwoy- > erkar / erku.