助詞N5
〜しか〜ない
only (with negative)
Structure
N + しか + V-ない
Explanation
Indicates limitation meaning "only". Emphasizes small quantity or narrow range. しか must pair with a negative, but the meaning is affirmative "only".
Examples
お金が100円しかありません。
I only have 100 yen.
私は日本語しか話せません。
I can only speak Japanese.
Note
Both しか〜ない and だけ mean "only". しか emphasizes scarcity; だけ is neutral. しか must be followed by negative.