助詞N5
〜だけ
only / just
Structure
N + だけ + V
Explanation
Indicates limitation meaning "only/just". だけ is neutral and can be followed by either affirmative or negative.
Examples
りんごを一つだけ食べました。
I ate just one apple.
好きなだけ取ってください。
Please take as many as you like.
Note
だけ is neutral; しか〜ない implies "not enough". 好きなだけ = as much as you like.