有用 ゆうよう 生物 せいぶつ ぐんじゃありませんでした
yū yōbiseibu tsugunja arimasendeshita

Noun
Desu Copula

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

1. Were not beneficial microorganisms.; Were not useful microbes.

Past/Perfective
Negative
Polite
Terminal Form