Causal Sentence Groups in Chinese
因果复句
A causal sentence group links a reason to its consequence. The relation may be understood from two complete clauses without an overt connector, or it may be marked explicitly with 因为 in the cause and 所以 in the result. The pattern explains why a result holds; it does not require both markers whenever context already makes that relation clear.
Published August 15, 2026
Reviewed August 15, 2026
01 / PATTERN
See the Structure
MODEL
Cause Clause，(因为……所以……) + Result Clause
Read the structure
A causal sentence group links a reason to its consequence. The relation may be understood from two complete clauses without an overt connector, or it may be marked explicitly with 因为 in the cause and 所以 in the result. The pattern explains why a result holds; it does not require both markers whenever context already makes that relation clear. Keep the model Cause Clause，(因为……所以……) + Result Clause visible while you compare each sentence.
我今天太忙了，午饭都没吃。
I was so busy today that I did not even eat lunch.
Choose the right context
Explain why an event or state has a particular result. Use 因为 before an explicit cause and 所以 before its result. Leave the relation unmarked only when both clauses and their causal link remain clear.
那个学生病了，没来上课。
That student was ill, so he did not come to class.
Respect the boundary
Do not leave either side of an explicit 因为所以 pair without a clause. Do not treat two merely consecutive events as automatically causal. Do not place 因为 and 所以 together before the same clause.
因为，所以我今天不做饭。
(Because, so I will not cook today.)
Repair the pattern
The cause clause is missing: 因为 must introduce a cause rather than stand alone before the result. The result connector has no result: 所以 must introduce a complete result clause in this standalone sentence.
因为很累，所以我今天不做饭。
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.
我今天太忙了，午饭都没吃。
I was so busy today that I did not even eat lunch.
我
Cause Clause，(因为……所以……)
This part occupies the Cause Clause，(因为……所以……) position in the model pattern.
今天
Result Clause
This part occupies the Result Clause position in the model pattern.
太忙
Cause Clause，(因为……所以……)
This part occupies the Cause Clause，(因为……所以……) position in the model pattern.
了
Result Clause
This part occupies the Result Clause position in the model pattern.
，
Cause Clause，(因为……所以……)
This part occupies the Cause Clause，(因为……所以……) position in the model pattern.
午饭
Result Clause
This part occupies the Result Clause position in the model pattern.
都没
Cause Clause，(因为……所以……)
This part occupies the Cause Clause，(因为……所以……) position in the model pattern.
吃
Result Clause
This part occupies the Result Clause 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.
我今天太忙了，午饭都没吃。
I was so busy today that I did not even eat lunch.
那个学生病了，没来上课。
That student was ill, so he did not come to class.
因为很累，所以我今天不想做饭。
Because I am tired, I do not want to cook today.
因为明天有考试，所以我想早点睡觉。
Because there is an exam tomorrow, I want to sleep early.
04 / LIMITS
When to Use It — and When Not To
Use it when
- Explain why an event or state has a particular result.
- Use 因为 before an explicit cause and 所以 before its result.
- Leave the relation unmarked only when both clauses and their causal link remain clear.
Do not use it when
- Do not leave either side of an explicit 因为所以 pair without a clause.
- Do not treat two merely consecutive events as automatically causal.
- Do not place 因为 and 所以 together before the same clause.
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.
因为，所以我今天不做饭。
因为很累，所以我今天不做饭。
The cause clause is missing
因为 must introduce a cause rather than stand alone before the result.
因为他病了，所以。
因为他病了，所以他没来上课。
The result connector has no result
所以 must introduce a complete result clause in this standalone sentence.
因为，所以我今天不做饭。
因为 must introduce a cause rather than stand alone before the result.
因为他病了，所以。
所以 must introduce a complete result clause in this standalone sentence.
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 因果复句.
07 / APPLY
Apply It in Your Sentence
Write one original sentence with 因果复句. 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
Causal Sentence Groups Questions
Must 因为 and 所以 always appear together?
No. Mandarin can use either marker alone, or no marker when the causal relation is unmistakable. Keeping both is useful when the relation needs to be explicit.
How is this different from simple sequence?
A causal group says that one situation explains the other. A sequence only places events in an order and does not by itself claim that the first caused the second.
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.
Chinese 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 2 item 【二68】, PDF pp. 195-196 (printed pp. 189-190)
Places marked and unmarked causal sentence groups at Level 2 and supplies complete cause-result examples.
Official source现代汉语语法课程讲义
包头师范学院 · 包头师范学院 · 2024
Locator: Causal complex sentences, slides 58-59
Defines causal clauses as reason-result relations and lists 因为所以 and other explicit causal connective families.
Official source10 / CONTINUE
Continue with a Connected Rule
Continue learning
因为…所以因为...所以 (Because... So)
Continue from the basic cause-first 因为所以 pair to the broader causal sentence-group inventory.
Compare
由于…因此…由于...因此...: Cause to Result
Compare formal 由于因此 linkage with the broader category that also permits other causal connectives.
Easy to confuse
之所以…是因为/是由于…之所以...是因为...: Explaining Why
Distinguish ordinary cause-first order from the result-first explanatory focus of 之所以是因为.
Continue learning
偏正关系句群Subordinate Relations Across Sentence Groups
Continue from one causal relation to subordinate discourse relations spanning several complete sentences.
RECOMMENDED NEXT
Continue learning
Continue from the basic cause-first 因为所以 pair to the broader causal sentence-group inventory.