除非⋯⋯，才⋯⋯
Explanation
该结构用于强调必要条件，表示只有满足'除非'后的条件，才会出现'才'后的结果。
This structure emphasizes a necessary condition, indicating that the result after '才' will only occur if the condition after '除非' is met.
Examples
除非你答应我，我才和你一起去。
Unless you agree to my terms, I won't go with you.
除非你努力学习，才有可能考上大学。
You'll only have a chance to get into university if you study hard.
除非心情好，他才会答应我们的要求。
He will only agree to our request if he's in a good mood.
Related Grammar Points
除非⋯⋯，否则/不然⋯⋯HSK 5五49
句子的类型 · 条件复句
表示唯一的条件，如果不满足这个条件，就会产生后面所说的后果。
This structure indicates that the first clause is the only condition that can prevent the outcome in the second clause. If the condition is not met, the negative result will occur.
Examples (2)
除非坐飞机去，否则肯定来不及了。
Unless I go by plane, I will definitely be too late.
除非你仔细检查，不然太容易舟错了。
Unless you check carefully, it is too easy to make mistakes.