子供 こども部屋 へや 使用 しようおばさんではありませんでした
kodomoe yamishiyō obasandewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 子供部屋未使用おばさん

1. Was not an unused aunt in the children's room.; Was not a woman who hadn't used the children's room.

Past/Perfective
Negative
Polite
Formal Register