所: Object-Focused Relative Expression in Chinese
所
所 appears before a transitive verb in formal object-focused relative expressions such as 我所做的事 and 据我所知. The understood object is supplied by the following noun or context. 所 must stay before the verb, cannot take aspect marking, and requires a verb capable of relating to that understood object.
Published July 23, 2026
Reviewed July 23, 2026
01 / PATTERN
See the Structure
MODEL
Subject + 所 + Verb + 的 + Noun / 所 + Verb
Read the structure
所 appears before a transitive verb in formal object-focused relative expressions such as 我所做的事 and 据我所知. The understood object is supplied by the following noun or context. 所 must stay before the verb, cannot take aspect marking, and requires a verb capable of relating to that understood object. Keep the model Subject + 所 + Verb + 的 + Noun / 所 + Verb visible while you compare each sentence.
你所做的每件事我都支持。
I support everything you do.
Choose the right context
Form a formal relative modifier: 我所写的文章。 Use fixed frames such as 据我所知 or 众所周知. Focus the object affected by the following transitive verb.
据我所知，这件事不是真的。
As far as I know, this matter is not true.
Respect the boundary
Do not place 所 after the verb. Do not attach 了 to 所. Do not use it before a verb with no possible understood object in this pattern.
这是他所了写的小说。
(This is the novel he suo-le wrote.)
Repair the pattern
了 is attached to the structural particle: 所 is a structural marker before the verb and cannot take the aspect particle 了. 所 follows the relative verb: The fixed relative order is subject + 所 + verb + 的 + noun.
这是他所写的小说。
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.
你所做的每件事我都支持。
I support everything you do.
你
Subject
This part occupies the Subject position in the model pattern.
所
所
This part occupies the 所 position in the model pattern.
做的
Verb
This part occupies the Verb position in the model pattern.
每件事
的
This part occupies the 的 position in the model pattern.
我
Noun / 所
This part occupies the Noun / 所 position in the model pattern.
都
Verb
This part occupies the Verb position in the model pattern.
支持
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.
你所做的每件事我都支持。
I support everything you do.
据我所知，这件事不是真的。
As far as I know, this matter is not true.
这是他所写的第一本小说。
This is the first novel he wrote.
04 / LIMITS
When to Use It — and When Not To
Use it when
- Form a formal relative modifier: 我所写的文章。
- Use fixed frames such as 据我所知 or 众所周知.
- Focus the object affected by the following transitive verb.
Do not use it when
- Do not place 所 after the verb.
- Do not attach 了 to 所.
- Do not use it before a verb with no possible understood object in this pattern.
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.
这是他所了写的小说。
这是他所写的小说。
了 is attached to the structural particle
所 is a structural marker before the verb and cannot take the aspect particle 了.
这是他写所的小说。
这是他所写的小说。
所 follows the relative verb
The fixed relative order is subject + 所 + verb + 的 + noun.
这是他所了写的小说。
所 is a structural marker before the verb and cannot take the aspect particle 了.
这是他写所的小说。
The fixed relative order is subject + 所 + verb + 的 + noun.
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 所.
07 / APPLY
Apply It in Your Sentence
Write one original sentence with 所. 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
所: Object-Focused Relative Expression Questions
Is 所 required in every relative clause?
No. It is a formal object-focused option; ordinary verb + 的 relatives often omit it.
What is omitted after the verb?
The object is understood from the following head noun or discourse context.
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: GF0025-2021 Appendix A, Level 6 item 【六22】, 结构助词：所
Supports placement in HSK 6; it does not independently establish the usage explanation.
Official sourceA Reference Grammar of Chinese
Huang, Shi and Li · Cambridge University Press · 2022
Locator: Chapter 9, §§9.1–9.3, relative constructions and grammatical relations
Supports pre-nominal relative constructions with an object gap and the modifier-before-head order used by 所 + verb + 的.
Official source10 / CONTINUE
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