(除非)...才... sets a necessary condition.
Only if
Must use 才
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Requires 才
- ✅ 除非你來，才開始。
- ❌ 除非你來，就開始。
Necessary condition
- ✅ 除非下雨，才停。
- ❌ 除非下雨也停。
Only if you register first will there be a seat.
Only with sufficient evidence will the court accept the case.
Only if you explain in person will he believe it.
Only if it is finished today will tomorrow avoid delay.
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