ようこえがわいるかじゃなかったです
揚子江河海豚じゃなかったです
yōkoegawa irukajanakattadesu

Noun
Desu Copula

The polite, past negative form of ようすこうかわいるか

1. Wasn't a Yangtze River dolphin.; Wasn't a river dolphin of the Yangtze.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana