Verb こそすれ JLPT N1
~koso sure
Often used in the pattern 'Xこそすれ、Y〜ない', meaning 'One might do X, but definitely not Y'.
Formation
Verb-ますstem + こそすれ、(絶対に)~ない
Explanation
Verb-ますstem + こそすれ is typically used to emphasize that while someone might certainly do or be X, there's no way they would do or be Y. The sentence that follows is usually a strong negative, denying the possibility of Y.
Example sentences
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He might help his friends, but he never belittles himself.
Kare wa tomodachi o tasuke koso sure, jibun o higesuru koto wa arimasen.
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She might cook, but she rarely cleans.
Kanojo wa ryōri koso sure, sōji wa hotondo shinai.
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He might study a lot, but he barely has time to have fun.
Watashi no ani wa benkyō koso sure, asobu jikan ga hotondo nai.
母は働きこそすれ、自分のために時間を使うことはほとんどない。
My mother might work a lot, but she hardly spends any time on herself.
Haha wa hataraki koso sure, jibun no tame ni jikan o tsukau koto wa hotondo nai.