な-adjectives (affirmative past tense)

About

な-adjectives are one of the two types of adjectives in Japanese. な-adjectives are very similar to nouns, and unlike い-adjectives, may be followed by だ.

The past tense of な-adjectives is identical to the past tense of nouns.

For the affirmative casual, or plain form, simply add だった.

For polite past tense な-adjectives, add でした.

Remember that some な-adjectives end in い and therefore may appear to be い-adjectives (e.g. きれい).

Summary

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  Past tense な-adjectives can be formed by attaching だった for casual speech, or でした for polite speech.