Adjective Reduplication: AA and AABB in Chinese
形容词重叠
Reduplicating a suitable adjective gives a vivid, descriptive quality rather than simply increasing its degree. Many one-syllable adjectives use AA, while many descriptive two-syllable adjectives use AABB. A reduplicated form can modify a noun with 的, describe a state, or modify an action with 地.
Published July 23, 2026
Reviewed July 23, 2026
01 / PATTERN
See the Structure
MODEL
A → AA; AB → AABB (+ 的 / 地)
Read the structure
Reduplicating a suitable adjective gives a vivid, descriptive quality rather than simply increasing its degree. Many one-syllable adjectives use AA, while many descriptive two-syllable adjectives use AABB. A reduplicated form can modify a noun with 的, describe a state, or modify an action with 地. Keep the model A → AA; AB → AABB (+ 的 / 地) visible while you compare each sentence.
她穿着一条长长的裙子。
She is wearing a long, flowing skirt.
Choose the right context
Give a noun a vivid quality: 她穿着一条长长的裙子。 Describe the resulting appearance of something: 房间收拾得干干净净。 Describe how an action is performed: 孩子们高高兴兴地回家了。
房间收拾得干干净净。
The room has been made thoroughly clean and tidy.
Respect the boundary
Do not add 很 before a reduplicated descriptive adjective as though it were an ordinary degree predicate. Do not assume every two-syllable adjective permits AABB reduplication; the pattern is lexically restricted. Do not use ABAB when the intended adjectival pattern is AABB, such as 干干净净.
这个房间很干干净净。
(This room is very clean-clean-tidy-tidy.)
Repair the pattern
A degree adverb is added before an already reduplicated descriptive form: 干干净净 is already a reduplicated descriptive form; 很 cannot be placed directly before it as an additional degree marker. A two-syllable adjective is repeated as ABAB instead of the required AABB pattern: The adjectival reduplication of 高兴 uses AABB: 高高兴兴. ABAB does not form the intended descriptive adjective here.
这个房间干干净净的。
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.
她穿着一条长长的裙子。
She is wearing a long, flowing skirt.
她
A → AA; AB → AABB (
This part occupies the A → AA; AB → AABB ( position in the model pattern.
穿着
的 / 地)
This part occupies the 的 / 地) position in the model pattern.
一条
A → AA; AB → AABB (
This part occupies the A → AA; AB → AABB ( position in the model pattern.
长
的 / 地)
This part occupies the 的 / 地) position in the model pattern.
长
A → AA; AB → AABB (
This part occupies the A → AA; AB → AABB ( position in the model pattern.
的
的 / 地)
This part occupies the 的 / 地) position in the model pattern.
裙子
A → AA; AB → AABB (
This part occupies the A → AA; AB → AABB ( 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.
她穿着一条长长的裙子。
She is wearing a long, flowing skirt.
房间收拾得干干净净。
The room has been made thoroughly clean and tidy.
孩子们高高兴兴地回家了。
The children went home happily.
04 / LIMITS
When to Use It — and When Not To
Use it when
- Give a noun a vivid quality: 她穿着一条长长的裙子。
- Describe the resulting appearance of something: 房间收拾得干干净净。
- Describe how an action is performed: 孩子们高高兴兴地回家了。
Do not use it when
- Do not add 很 before a reduplicated descriptive adjective as though it were an ordinary degree predicate.
- Do not assume every two-syllable adjective permits AABB reduplication; the pattern is lexically restricted.
- Do not use ABAB when the intended adjectival pattern is AABB, such as 干干净净.
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.
这个房间很干干净净。
这个房间干干净净的。
A degree adverb is added before an already reduplicated descriptive form
干干净净 is already a reduplicated descriptive form; 很 cannot be placed directly before it as an additional degree marker.
她高兴高兴地回家了。
她高高兴兴地回家了。
A two-syllable adjective is repeated as ABAB instead of the required AABB pattern
The adjectival reduplication of 高兴 uses AABB: 高高兴兴. ABAB does not form the intended descriptive adjective here.
这个房间很干干净净。
干干净净 is already a reduplicated descriptive form; 很 cannot be placed directly before it as an additional degree marker.
她高兴高兴地回家了。
The adjectival reduplication of 高兴 uses AABB: 高高兴兴. ABAB does not form the intended descriptive adjective here.
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 形容词重叠.
07 / APPLY
Apply It in Your Sentence
Write one original sentence with 形容词重叠. 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
Adjective Reduplication: AA and AABB Questions
Does adjective reduplication simply mean very?
No. It normally makes a quality more vivid or descriptive. It is not a mechanical replacement for 很 or 非常.
Can every Chinese adjective be reduplicated?
No. Reduplication depends on the adjective and the intended function. Learn common forms as established patterns.
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 grammar inventory, item 08 (A.2.1.3): adjective reduplication AA and AABB
Supports placement in HSK 2; it does not independently establish the usage explanation.
Official sourceChinese: A Comprehensive Grammar, 2nd ed.
Yip and Rimmington · Routledge · 2016
Locator: Chapter 4, sections 4.4 and 4.6.4, pages 77-78 and 86-88
Explains that reduplicated adjectives are descriptive, commonly take 的 in attributive use, and are limited to adjectives that permit the relevant reduplication pattern.
Official source10 / CONTINUE
Continue with a Connected Rule
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看上去看上去: Looking a Certain Way
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Compare this lesson with 仿佛 presenting an impression as if it were true; both belong to descriptive state and inferred appearance, but they organize a different sentence role or discourse job.
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