いっ らん せい双生 そうせい ではありませんでした
i' ranseisōseijidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 一卵性双生児

1. Was not a monozygotic twin.; Was not an identical twin.

Past/Perfective
Negative
Polite
Formal Register