除非
chúfēi
only if (..., or otherwise, ...); only when
In a story
胡青不走，站在雨里说：“除非先生答应教我，不然我每天晚上都来敲门。”Hu Qing didn't leave. Standing in the rain, she said, “Unless you agree to teach me, I will come and knock on this door every night.”狐狸学字 · The Fox Who Learned to Read · HSK 5
Grammar with 除非
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