つぶてじゃなかったです
礫じゃなかったです
tsubutejanakattadesu

Noun
Desu Copula

The polite, past negative form of つぶて

1. Wasn't a pebble.; Wasn't gravel.; Wasn't stony.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana