Prepositional 为 for Purpose or Cause in Chinese
为 + 目的 / 原因
The preposition 为 introduces a purpose, cause, or matter that motivates a following action or feeling. It normally precedes that noun phrase and the main predicate, as in 为健康锻炼 and 为成绩高兴. This lesson excludes 为 introducing a beneficiary and the formal copular reading pronounced wéi.
Published August 2, 2026
Reviewed August 2, 2026
01 / PATTERN
See the Structure
MODEL
Subject + 为 + Purpose / Cause + Verb or Adjective
Read the structure
The preposition 为 introduces a purpose, cause, or matter that motivates a following action or feeling. It normally precedes that noun phrase and the main predicate, as in 为健康锻炼 and 为成绩高兴. This lesson excludes 为 introducing a beneficiary and the formal copular reading pronounced wéi. Keep the model Subject + 为 + Purpose / Cause + Verb or Adjective visible while you compare each sentence.
我每天为健康锻炼。
I exercise every day for my health.
Choose the right context
State the purpose motivating an action. Name the cause of an emotion or response. Use a compact, often neutral or written prepositional phrase.
大家为他的成绩高兴。
Everyone is happy about his result.
Respect the boundary
Do not place 为 after the purpose noun phrase. Do not split 为 from the noun phrase it introduces. Do not confuse this preposition with copular 为 pronounced wéi.
我每天健康为锻炼。
(I health for exercise every day.)
Repair the pattern
The purpose phrase precedes its preposition: 为 must stand before the purpose noun phrase and the following predicate. The predicate splits 为 from its cause: 为 directly introduces the cause phrase; 高兴 follows the complete phrase.
我每天为健康锻炼。
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.
我每天为健康锻炼。
I exercise every day for my health.
我
Subject
This part occupies the Subject position in the model pattern.
每天
为
This part occupies the 为 position in the model pattern.
为
Purpose / Cause
This part occupies the Purpose / Cause position in the model pattern.
健康
Verb or Adjective
This part occupies the Verb or Adjective position in the model pattern.
锻炼
Subject
This part occupies the Subject 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.
我每天为健康锻炼。
I exercise every day for my health.
大家为他的成绩高兴。
Everyone is happy about his result.
我们为明天的比赛做准备。
We are preparing for tomorrow's match.
04 / LIMITS
When to Use It — and When Not To
Use it when
- State the purpose motivating an action.
- Name the cause of an emotion or response.
- Use a compact, often neutral or written prepositional phrase.
Do not use it when
- Do not place 为 after the purpose noun phrase.
- Do not split 为 from the noun phrase it introduces.
- Do not confuse this preposition with copular 为 pronounced wéi.
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.
我每天健康为锻炼。
我每天为健康锻炼。
The purpose phrase precedes its preposition
为 must stand before the purpose noun phrase and the following predicate.
大家为高兴他的成绩。
大家为他的成绩高兴。
The predicate splits 为 from its cause
为 directly introduces the cause phrase; 高兴 follows the complete phrase.
我每天健康为锻炼。
为 must stand before the purpose noun phrase and the following predicate.
大家为高兴他的成绩。
为 directly introduces the cause phrase; 高兴 follows the complete phrase.
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 为 + 目的 / 原因.
07 / APPLY
Apply It in Your Sentence
Write one original sentence with 为 + 目的 / 原因. 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
Prepositional 为 for Purpose or Cause Questions
How is 为 different from 为了?
Both can mark purpose. 为 is compact and often more formal, while 为了 readily introduces an explicit purpose phrase or clause.
Is this 为 pronounced wéi?
No. The preposition is pronounced wèi. Copular or lexical 为 meaning be or act as is pronounced wéi.
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 【二28】, PDF p. 189
Places prepositional 为 at Level 2 with purpose and cause 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: 第四节短语，介词短语；例‘为健康而锻炼’
Treats 为 plus a noun phrase as a preverbal prepositional phrase expressing purpose.
Official sourceLaoshi Chinese Grammar Reference
Laoshi editorial team · Laoshi · 2026
Locator: Using 为 as a preposition, cause and purpose sections
Explains purpose and cause uses and distinguishes them from beneficiary and copular readings.
Official source10 / CONTINUE
Continue with a Connected Rule
Easy to confuse
为 + 对象为 Introducing a Beneficiary
The same 为 form introduces a beneficiary or a motivating purpose and cause in different frames.
Easy to confuse
为了…而…为了...而...: For a Purpose
Compare compact purpose 为 with explicit 为了 and the formal purpose frame 为了…而….
Compare
因为…所以因为...所以 (Because... So)
为 introduces a compact cause phrase, while 因为…所以 links explicit cause and result clauses.
Continue learning
替替: Acting on Someone's Behalf
Extend participant marking to 替 when someone benefits or another person acts in their place.
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Easy to confuse
The same 为 form introduces a beneficiary or a motivating purpose and cause in different frames.