Making a past tense adjectival sentence in the plain form varies by whether the adjective is an い-adjective or a な-adjective.
For い-adjectives the final です is simply dropped after the -かった ending.
English | Japanese |
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The meal was unpalatable. | 食事 は まずかった。syokuzi ha mazukatta. |
Your answer was not correct. | あなた の 答え は 正しく なかった。anata no kotae ha tadasiku nakatta. |
For な-adjectives, the adjective is followed by the plain past form of the copula, だった. And for the negative form, we drop the polite です after じゃ なかった.
English | Japanese |
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Mary liked it very much. | メアリー さん は とても 好き だった。mearii san ha totemo suki datta. |
The library was not quiet. | 図書館 は 静か じゃ なかった。tosyokan ha sizuka zya nakatta. |