〜でした / 〜じゃありませんでした
JLPT N5 Adjectivesna-adjectives: past and negative past
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Na-adjectives form the past with deshita and the negative past with ja arimasen deshita, exactly like nouns. The adjective itself does not change. Compare i-adjectives, which conjugate internally instead.
Examples
はでした。 Kinou wa hima deshita.
I was free yesterday.
はじゃませんでした。 Matsuri wa nigiyaka ja arimasen deshita.
The festival was not lively.