有用 ゆうよう 生物 せいぶつ ぐんじゃなかったです
yū yōbiseibu tsugunja nakattadesu

Noun
Desu Copula

The polite, past negative form of 有用微生物群

1. Were not useful microorganisms.

Past/Perfective
Negative
Polite
Casual Register