-тай

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-тай • (-taj)

1. Used to form adjectives from nouns.

From the development of the derivational suffix into a case form.

-тай • (-taj)

1. Marks the comitative case:
   1. In the regular and hidden-n declensions after a stem ending in a consonant.

      ‎муур (muur, “cat”) + ‎-тай (-taj) → ‎мууртай (muurtaj, “with the cat”)

   2. In the regular and hidden-n declensions after a long vowel, diphthong, iotated vowel or short vowel (which is retained).

      ‎малгай (malgaj, “hat”) + ‎-тай (-taj) → ‎малгайтай (malgajtaj, “with a hat”)

   3. In the regular and hidden-n declensions after a stem ending in б (b), в (v), г (g), л (l), м (m), н (n) or р (r) followed by ь (ʹ) or и (i) (which is retained).

      ‎туурь (tuurʹ, “ruins”) + ‎-тай (-taj) → ‎туурьтай (tuurʹtaj, “with the ruins”)

   4. In the hidden-g declension.

      ‎хувин (xuvin, “bucket”) + ‎-тай (-taj) → ‎хувинтай (xuvintaj, “[along] with a bucket”)

2. With numerals, expresses age in years.

   чи арвантай болно. ― či arvantaj bolno. ― You will be ten years old.

• -итай (-itaj)