Grammar › Quantity › だけ
だけ
"Only / just." A neutral limit: out of everything that was possible, this — and nothing else. It sits after nouns, verbs and amounts alike.
The short version
Put だけ straight after a noun, a plain-form verb, or an amount, and it caps it at "only that". It's the plain, matter-of-fact "only" — no positive or negative colour of its own. (A な-adjective takes な first: 好きなだけ.)
水だけ — just water · noun
見るだけ ／ 一つだけ — just look · just one
Noun + だけ — "only that"
The most common shape: だけ trims a noun down to it alone.
日本語だけ。
Japanese only. (日本語 + だけ — nothing but Japanese)
Amount + だけ — "just this much"
After a quantity, だけ says "no more than". It pairs naturally with 少し ("a little") and 一つ ("one").
雲は少しだけ。
Just a few clouds. (少し + だけ — only a little)
The fixed phrases: できるだけ & だけで
Two set expressions you'll hear constantly: できるだけ ("as much as one can" → "as … as possible") and 〜だけで ("just by / with only …").
できるだけ
as much as possible (できる + だけ — "to the extent one can")
Watch out
🗣 だけ vs しか〜ない. Both mean "only", but they feel different. だけ is a neutral cap ("just water, thanks"). しか always ends in a negative and adds a "and that's not enough / that's all there is" colour: 水しかない ("there's only water"). Reach for だけ to state a limit plainly; しか to lament it.
だけしか for extra punch. Stack them — 一つだけしかない ("there's just the one, nothing more") — and you get an emphatic "nothing but", still closing on a negative. Note だけ itself never forces a negative; that's しか's job.
Next: 〜しか〜ない — nothing but → · 〜すぎる → · All grammar
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