腐敗 ふはい細菌 さいきんではありませんでした
fuhaisaikindewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 腐敗細菌

1. Was not putrefactive bacteria.; Was not a putrefying bacterium.

Past/Perfective
Negative
Polite
Formal Register