除非...否则... (chúfēi...fǒuzé) in Chinese
除非…否则/不然…
除非...否则/不然... states an exception and then gives the consequence that holds if that exception is not met. 除非 introduces the only escape or required exception; 否则 or 不然 means otherwise. Unlike 除非...才..., this frame describes the consequence of failing the condition rather than the result enabled by meeting it.
Published July 17, 2026
Reviewed July 17, 2026
01 / PATTERN
See the Structure
MODEL
除非 + Exception, 否则/不然 + Result
Read the structure
除非...否则/不然... states an exception and then gives the consequence that holds if that exception is not met. 除非 introduces the only escape or required exception; 否则 or 不然 means otherwise. Unlike 除非...才..., this frame describes the consequence of failing the condition rather than the result enabled by meeting it. Keep the model 除非 + Exception, 否则/不然 + Result visible while you compare each sentence.
除非现在出发，否则我们会迟到。
Unless we leave now, we will be late.
Choose the right context
To state an exception to a negative consequence: 除非现在出发，否则会迟到。 To give a requirement and warning: 除非本人同意，不然不能公开。 With the exception after the main warning in speech: 我们会迟到，除非现在就走。
除非本人同意，不然不能公开这份材料。
Unless the person agrees, this material cannot be made public.
Respect the boundary
Do not use 否则 to state the result that follows when the 除非 condition is met; use 才 for that relation. Do not stack 除非 and 否则 before the exception clause. Do not assume 除非 must always be sentence-initial; a postposed exception can be grammatical.
除非否则现在出发，我们会迟到。
(Unless we leave now, we will be late.)
Repair the pattern
除非 and 否则 are stacked before the exception: 除非 introduces the exception 现在出发, while 否则 introduces the consequence if that exception is not met. 否则 is placed after the consequence-clause subject: As a connector meaning 'otherwise,' 否则 comes before the consequence clause and its subject in this sentence.
除非现在出发，否则我们会迟到。
Use the repaired structure without changing the intended meaning.
02 / MAP
Read the Sentence
Read from left to right and notice the job performed by each part. The labels describe this example; they are not a rule that every Chinese sentence must copy.
除非现在出发，否则我们会迟到。
Unless we leave now, we will be late.
除非
除非
This part occupies the 除非 position in the model pattern.
现在
Exception, 否则/不然
This part occupies the Exception, 否则/不然 position in the model pattern.
出发
Result
This part occupies the Result position in the model pattern.
，
除非
This part occupies the 除非 position in the model pattern.
否则
Exception, 否则/不然
This part occupies the Exception, 否则/不然 position in the model pattern.
我们
Result
This part occupies the Result position in the model pattern.
会
除非
This part occupies the 除非 position in the model pattern.
迟到
Exception, 否则/不然
This part occupies the Exception, 否则/不然 position in the model pattern.
03 / EXAMPLES
Examples You Can Reuse
Keep the structure stable while changing the people, objects, times, or conditions. Pinyin is shown as reading support; use the Chinese sentence and translation to confirm the grammar relationship.
除非现在出发，否则我们会迟到。
Unless we leave now, we will be late.
除非本人同意，不然不能公开这份材料。
Unless the person agrees, this material cannot be made public.
我们会迟到，除非现在就走。
We will be late unless we leave right now.
04 / LIMITS
When to Use It — and When Not To
Use it when
- To state an exception to a negative consequence: 除非现在出发，否则会迟到。
- To give a requirement and warning: 除非本人同意，不然不能公开。
- With the exception after the main warning in speech: 我们会迟到，除非现在就走。
Do not use it when
- Do not use 否则 to state the result that follows when the 除非 condition is met; use 才 for that relation.
- Do not stack 除非 and 否则 before the exception clause.
- Do not assume 除非 must always be sentence-initial; a postposed exception can be grammatical.
05 / REPAIR
Compare Right and Wrong
Compare the smallest meaningful change. Each explanation identifies a placement, scope, form, or clause relationship instead of treating the whole sentence as one undifferentiated mistake.
除非否则现在出发，我们会迟到。
除非现在出发，否则我们会迟到。
除非 and 否则 are stacked before the exception
除非 introduces the exception 现在出发, while 否则 introduces the consequence if that exception is not met.
除非现在出发，我们否则会迟到。
除非现在出发，否则我们会迟到。
否则 is placed after the consequence-clause subject
As a connector meaning 'otherwise,' 否则 comes before the consequence clause and its subject in this sentence.
除非否则现在出发，我们会迟到。
Separate the exception and consequence markers: 除非现在出发，否则我们会迟到。
除非现在出发，我们否则会迟到。
Put 否则 before the consequence clause: 否则我们会迟到。
06 / PRACTICE
Practice the Grammar Point
Complete three short tasks in order: judge the pattern, repair a common error, and build the sentence. Feedback is fixed and reviewed, so these activities do not use a checker allowance.
1. Judge the sentence
2. Choose the correction
3. Build the sentence
Build a complete sentence with 除非…否则/不然….
07 / APPLY
Apply It in Your Sentence
Write one original sentence with 除非…否则/不然…. Your draft moves to the checker through this browser session, selects this grammar point as the first review focus, and waits for you to submit.
08 / QUESTIONS
除非...否则... (chúfēi...fǒuzé) Questions
What is the difference between 除非...否则... and 除非...才...?
除非 P，否则 Q gives the consequence when P is not met. 除非 P，才 R states that P is required for R. The two frames look at opposite sides of the same condition.
Can 除非 come at the end of a sentence?
Yes. A postposed exception such as 我不会改变计划，除非天气恶化 is grammatical. Do not reject it solely because 除非 is not sentence-initial.
09 / SOURCES
Sources and Review Notes
These references support different parts of the lesson. GF0025-2021 supports level placement only; professional grammar works support the explanation, limits, examples, and cross-checks. Their inclusion does not imply endorsement.
Modern Mandarin Chinese Grammar: A Practical Guide, 3rd ed.
Ross, Ma, Chen, He and Yeh · Routledge · 2024
Locator: Construction index and function chapters relevant to 除非…否则/不然…
Supports the learner-facing account of where 除非…否则/不然… appears and what communicative job it performs.
Official sourceChinese: A Comprehensive Grammar, 2nd ed.
Yip and Rimmington · Routledge · 2016
Locator: Relevant sentence and clause chapters for 除非…否则/不然…
Cross-checks the 除非 + Exception, 否则/不然 + Result pattern, clause relationship, and limits represented by the reviewed examples.
Official sourceChinese Proficiency Grading Standards for International Chinese Language Education (GF0025-2021)
Ministry of Education and State Language Commission · Ministry of Education of the PRC · 2021
Locator: Appendix A, Level 5 grammar inventory
Supports directory placement at HSK 5; it does not independently prove usage rules.
Official source10 / CONTINUE
Continue with a Connected Rule
Easy to confuse
除非…才除非...才 (Only If...Then...)
Compare required-condition wording with an explicit negative alternative.
Compare
只有…才只有...才: Only If Condition
Relate an unless warning to a necessary only-if condition.
Compare
一旦…就…一旦...就... (yídàn...jiù)
Separate an exception requirement from a decisive event trigger.
Learn first
否则…否则: Otherwise Result
Study the standalone otherwise connector inside a complete unless warning.
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Easy to confuse
Compare required-condition wording with an explicit negative alternative.