Of course you can also use “na adjectives” in casual “A ha B desu” patterns. But since we’re focusing on formal Japanese right now I’ll leave it up to you to find your own examples in your favorite Japanese media.
Transcript
言語ガールズ #67
Starting Off Too Easy
Blue: Adjectives that don’t end in い are sometimes called “na adjectives”.
Yellow: Because they need an extra な when placed before a noun.
Blue: Besides the な rule these adjectives don’t have any conjugations.
Blue: You can just plug them right into any form of “AはBです”.
Yellow: Past?
Blue: スマホは便利でした
Yellow: Negative?
Blue: スマホは便利ではありません
Yellow: Negative past?
Blue: スマホは便利ではありませんでした
Yellow: So our first lesson on adjective conjugation was all about adjectives that don’t need to be conjugated?
Blue: When you put it that way…