Translation guide
In Japanese, na-adjectives are a class of words that describe states or qualities and require the particle な when modifying nouns directly. This guide explains how to use them naturally.
The learner wants to use a na-adjective to modify a noun, e.g., 'a quiet person'.
Attach な directly to the na-adjective stem (the form without だ or です) before the noun.
a quiet person
a lively child
The learner wants to make a statement like 'It is quiet.' or 'She is kind.'
In casual speech, end with だ. In polite speech, use です. The adjective stem comes before.
This room is quiet.
She is kind.
Used in formal writing or speeches. More literary than だ/です.
This issue is important.
The learner wants to say something is not X, e.g., 'It is not quiet.'
Replace だ/です with ではない (casual) or ではありません (polite). In casual speech, じゃない is common.
It is not quiet.
It's not quiet. (casual)
I am not well.
The learner wants to say something was X, e.g., 'It was quiet.'
Change だ to だった (casual) or です to でした (polite).
Yesterday was quiet.
The exam was tough.
The learner wants to say something was not X, e.g., 'It was not quiet.'
Combine negative and past: ではなかった (casual, often contracted to じゃなかった) or ではありませんでした (polite).
It was not quiet.
It wasn't quiet. (casual)
It was not convenient.
The learner wants to describe how an action is done, e.g., 'quietly', 'kindly'.
Add に to the stem to turn the na-adjective into an adverb.
Please speak quietly.
He kindly taught me.
The learner wants to list multiple qualities, e.g., 'quiet and clean'.
Use the て-form of the na-adjective, which is で, to connect to another adjective or clause.
This room is quiet and clean.
He is kind and smart.
The learner wants to say something like 'a person who is kind'.
The same pattern as direct noun modification works for relative clauses. The na-adjective directly precedes the noun with な.
I like people who are kind.
A common mistake is to say 静かだ人 instead of 静かな人. The だ is only used at the end of a sentence, never before a noun.
a quiet person
Na-adjectives behave differently from i-adjectives. I-adjectives end in い and conjugate directly (e.g., 高い → 高くない), while na-adjectives need だ/です and use な before nouns. Some words like きれい (pretty) look like i-adjectives but are actually na-adjectives.
a pretty flower