Dear Tzungkuen,

Yes, the -to suffix can be used in the plural as well as the singular.
In the Saddaniiti, sutta rule no. 492 (tvaadayo ekabahvatthesu
vibhattisa~n~naa) with its gloss makes this clear. Also, according to
the following rule (Sd 493 with examples), the -to suffix can also be
used in the locative, instrumental, and genitive cases besides the
ablative.

Best wishes,
Jim

> Dear dhamma friends
>
> Is the suffix -to used in plural noun? Warder's Introduction to
> Pali seems to mention only its usage in singular noun, but in
> Mizuno Kogen's grammar book it is said to be used in both cases.
> so i am confused...
>
> with much metta
>
> Tzungkuen