modality N3 common casualpolitewritten

〜だけだ — it's only ~ / simply ~

〜だけだ・だけだ

Builds on 〜だけ

Meaning

it's just/only ~ (and nothing more) — frames the whole situation as limited to one thing, often to downplay it or to say what alone remains

私わたしはただ本当ほんとうのことを言いっただけだ。

I simply told the truth, that's all.

Attaches to	Form	Example
Verb (plain) / Noun	V(plain) + だけだ; N + だけだ	聞きいただけだ / 形かたちだけだ

心配しんぱいしないで、ちょっと疲つかれただけだから。

Don't worry — I'm just a little tired, that's all.

あとは結果けっかを待まつだけだ。

Now all that's left is to wait for the results.

彼かれは知しっていて黙だまっていただけだ。

He knew and simply kept quiet about it.

Often paired with ただ ('simply') to soften or excuse (ただ〜だけだ), or with あと(は) to mean 'the only thing left is to ~' (あとは〜だけだ).

Jengo shows 〜だけだ the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.

Sources Compiled with reference to A Dictionary of Intermediate Japanese Grammar. Editorial confidence: medium.