How to use 除非
除非 + exception，否则 / 不然 + result; 除非 + condition，才 + enabled result
除非 identifies an exception to the situation described in the rest of the sentence. With a negative main statement, it often corresponds to unless: the main outcome holds except under the named condition. The exception can come first or follow the main clause. This helps distinguish a limited possibility from a general prediction about what will happen.
When 除非 starts the sentence, 否则 or 不然 can introduce what happens if the exception does not apply. A related pattern uses 才 to state what becomes possible under that exceptional condition. Pay attention to the second clause's polarity: these structures describe the relationship differently, so merely swapping the linking word can change the intended meaning.
Examples with pinyin and English
我不去， 除非你也去。
I won't go unless you go too.
你不能进， 除非你有预约。
You can't come in unless you have an appointment.
我不说， 除非你答应我你不会生气。
I won't tell you unless you promise me you won't get upset.
你不会这么快升职， 除非你表现很好。
You won't get promoted so soon unless you perform very well.
What to remember
- Treat the 除非 clause as the exceptional condition.
- Use 否则 for what follows without that exception.
- Use 才 for the result enabled by the condition.
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Source and editorial notes
Explanation rewritten for Laowai. Examples are adapted from the Laowai English grammar curriculum, with editorial corrections where needed. The original curriculum credits AllSet Learning’s Chinese Grammar Wiki as used with permission. Read the retained source credits.
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