〜かったです / 〜くなかったです
JLPT N5 Adjectivesi-adjectives: past and negative past
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For the past of an i-adjective, drop i and add katta desu: tanoshii becomes tanoshikatta desu. The negative past is kunakatta desu. Never say takai deshita; the adjective itself changes, not the copula.
Examples
はたです。 Ryokou wa tanoshikatta desu.
The trip was fun.
はたです。 Tesuto wa muzukashikunakatta desu.
The test was not difficult.