X is X, Y is Y in Chinese
X是X，Y是Y
The spoken formula X是X，Y是Y repeats each noun or phrase as its own predicate to separate categories, responsibilities, or viewpoints. It often says that two sides should not be confused or that each fact should be treated on its own. The repeated slots normally keep the same lexical material.
Published August 11, 2026
Reviewed August 11, 2026
01 / PATTERN
See the Structure
MODEL
X 是 X，Y 是 Y
Read the structure
The spoken formula X是X，Y是Y repeats each noun or phrase as its own predicate to separate categories, responsibilities, or viewpoints. It often says that two sides should not be confused or that each fact should be treated on its own. The repeated slots normally keep the same lexical material. Keep the model X 是 X，Y 是 Y visible while you compare each sentence.
他是他，我是我，意见不同很正常。
He is he and I am I; different opinions are normal.
Choose the right context
Separate two people, facts, or viewpoints explicitly. Mark that each side has its own status or responsibility. Use the formula in conversational explanation or contrast.
一是一，二是二，这要分清楚。
One is one and two is two; keep them distinct.
Respect the boundary
Do not change the repeated phrase without a new construction. Do not use it as a neutral copular definition every time. Do not add a degree adverb before the bare noun predicate.
他是他，我是别人。
(He is he; I am someone else.)
Repair the pattern
The second slot changes the phrase: The formula repeats each phrase as its own predicate; changing the second slot removes the fixed contrastive frame. A degree adverb modifies the noun predicate: This frame uses 是 with a repeated nominal predicate, not 很 before the bare noun.
他是他，我是我。
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.
他是他，我是我，意见不同很正常。
He is he and I am I; different opinions are normal.
他是
X 是 X，Y 是 Y
This part occupies the X 是 X，Y 是 Y position in the model pattern.
他
X 是 X，Y 是 Y
This part occupies the X 是 X，Y 是 Y position in the model pattern.
，
X 是 X，Y 是 Y
This part occupies the X 是 X，Y 是 Y position in the model pattern.
我是
X 是 X，Y 是 Y
This part occupies the X 是 X，Y 是 Y position in the model pattern.
我
X 是 X，Y 是 Y
This part occupies the X 是 X，Y 是 Y position in the model pattern.
，
X 是 X，Y 是 Y
This part occupies the X 是 X，Y 是 Y position in the model pattern.
意见
X 是 X，Y 是 Y
This part occupies the X 是 X，Y 是 Y position in the model pattern.
不同
X 是 X，Y 是 Y
This part occupies the X 是 X，Y 是 Y position in the model pattern.
很
X 是 X，Y 是 Y
This part occupies the X 是 X，Y 是 Y position in the model pattern.
正常
X 是 X，Y 是 Y
This part occupies the X 是 X，Y 是 Y 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.
他是他，我是我，意见不同很正常。
He is he and I am I; different opinions are normal.
一是一，二是二，这要分清楚。
One is one and two is two; keep them distinct.
昨天是昨天，今天是今天，你得交作业。
Yesterday was yesterday; today is today, and you must hand in the homework.
成绩是成绩，态度是态度，两件事都要改。
Scores are scores and attitude is attitude; both need improvement.
04 / LIMITS
When to Use It — and When Not To
Use it when
- Separate two people, facts, or viewpoints explicitly.
- Mark that each side has its own status or responsibility.
- Use the formula in conversational explanation or contrast.
Do not use it when
- Do not change the repeated phrase without a new construction.
- Do not use it as a neutral copular definition every time.
- Do not add a degree adverb before the bare noun predicate.
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.
他是他，我是别人。
他是他，我是我。
The second slot changes the phrase
The formula repeats each phrase as its own predicate; changing the second slot removes the fixed contrastive frame.
他很他，我很我。
他是他，我是我。
A degree adverb modifies the noun predicate
This frame uses 是 with a repeated nominal predicate, not 很 before the bare noun.
他是他，我是别人。
The formula repeats each phrase as its own predicate; changing the second slot removes the fixed contrastive frame.
他很他，我很我。
This frame uses 是 with a repeated nominal predicate, not 很 before the bare 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 X是X，Y是Y.
07 / APPLY
Apply It in Your Sentence
Write one original sentence with X是X，Y是Y. 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
X is X, Y is Y Questions
Does X是X mean identity in a dictionary definition?
It can have literal identity, but the paired formula normally separates two sides in conversation. Context supplies the contrast or boundary reading.
Can the two phrases be longer than one word?
Yes. X and Y can be noun phrases or short clauses, as long as each side is repeated with 是 in the same frame.
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 4 item 【四70】, PDF p. 221 (printed p. 215)
Lists X是X，Y是Y and gives repeated nominal examples for separating two sides.
Official source对外汉语口语教学语法大纲的构建
徐晶凝 · 《语言教学与研究》 · 2016
Locator: §2.1, PDF pp. 3–5, spoken fixed formulas
Treats repeated copular formulas as spoken slot-and-filler constructions whose discourse meaning comes from parallel repetition.
Official source10 / CONTINUE
Continue with a Connected Rule
Easy to confuse
动词＋一X是一XV + 一X是 一X
Compare separating two categories with repeated units presented one item at a time.
Compare
时而…时而…时而...时而... (shí'ér...shí'ér)
Distinguish paired copular separation from temporal or situational alternation through 时而.
Continue learning
X是它，Y也是它X是它，Y也是它 Same Outcome
Continue to a paired copular formula where both alternatives lead to one outcome.
Compare
X归X，Y归YX归X，Y归Y Keep Matters Separate
Compare identity-like separation through 是 with explicitly keeping two considerations apart through 归.
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Easy to confuse
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