Grammar
N5 adjective

na-adjective past / negative でした・じゃなかった

Meaning

na-adjective conjugations use the copula. Past affirmative: でした. Past negative: じゃなかったです / ではありませんでした. Negative: じゃないです / ではありません.

Formation

Notes

Because na-adjectives conjugate via the copula, the rules are identical to noun conjugation. The な form is ONLY used before a noun.

Examples

In the past, this town was quiet. (past aff.)

Breakdown
long ago (comma) this town (topic) quiet was

Last week was busy, but this week was free.

Breakdown
last week (topic) was busy (polite) but this week (topic) free time was

I was not well yesterday. (past negative)

Breakdown
yesterday (topic) well was not (polite)

That shop is not famous. (formal negative)

Breakdown
that shop (topic) famous is not

This problem was not easy. (formal past neg.)

Breakdown
this problem (topic) easy was not

I don't like cats.

Breakdown
cat (topic) liked am not

⚠️ Often confused with

na-adjective predication 〜な + です

na-adjectives behave like nouns. As a predicate, just add です: 静かです. To modify a noun...