じゃなかった
Was not (casual)
About
じゃない attaches to な-adjectives and nouns, and makes them negative. To turn じゃない into the past tense, conjugate the い-adjective (ない) into なかった to form じゃなかった. じゃない is a casual negator and is therefore not suitable on its own for polite or formal situations.
じゃなかった can be made more polite by adding です.
じゃない turns a noun or な-adjective negative.
じゃない indicates casual speech.
The past tense of じゃない is じゃなかった.
じゃなかった can be made more polite by adding です.
Summary
Explained in
elementary #14
All About 「じゃない」: the Casual Negator
Example Sentences
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