# HSK 4 Fixed Phrase: X是X ，Y是Y Grammar Guide | HSKReady Canonical: https://hskready.app/en/grammar/hsk-4-fixed-phrases-f250a52f68 Language: en Content ID: web-grammar-hsk-4-fixed-phrases-f250a52f68 HSK levels: 4 Updated: 2026-10-23T04:56:22.922Z Scope: published website educational content; full vocabulary, question bank and mock exams remain in the app. Learn how to use the Chinese fixed phrase X是X ，Y是Y to draw a clear boundary between two separate matters, with structure, examples, and common mistakes. Grammar [HSK 4 · Fixed patterns](https://hskready.app/en/grammar/hsk-4#hsk-4-g042) # Separating Two Matters Clearly: X是X ，Y是Y The fixed phrase X是X ，Y是Y states that two things belong to separate categories and should not be mixed or allowed to interfere with each other, similar to English expressions like business is business. Noun / Matter X 是 Noun / Matter X ， Noun / Matter Y 是 Noun / Matter Y Example sentence 我们虽然关系好，但是朋友是朋友，生意是生意。 Wǒmen suīrán guānxì hǎo, dànshì péngyou shì péngyou, shēngyì shì shēngyì. Although we have a good relationship, friends are friends and business is business. A classic usage showing that personal friendship should not replace clear business terms. A common mistake × 虽然我们认识很久了，但是朋友是生意，生意是朋友，今天还是要把合同签好。 Suīrán wǒmen rènshi hěn jiǔ le, dànshì péngyou shì shēngyì, shēngyì shì péngyou, jīntiān háishi yào bǎ hétong qiān hǎo. Incorrect: Although we have known each other for a long time, friends are business and business is friends, so today we still need to sign the contract properly. In this context, cross-pairing the nouns equates friendship with business, contradicting the intended boundary. The next example keeps each noun on both sides of its own 是 while retaining the contract and the existing friendship. Corrected example: 虽然我们认识很久了，但是朋友是朋友，生意是生意，今天还是要把合同签好。 **Read the full explanation and examples** ## Core Meaning and Syllabus Scope In the HSK 4 grammar outline, X是X ，Y是Y is listed under fixed expressions (固定格式 - 固定短语). At first glance, saying that X is X and Y is Y looks like stating the obvious. In actual Chinese communication, however, this symmetrical pattern has a very specific pragmatic job: it draws a firm line between two domains that a listener might be tempted to mix together. Speakers use this pattern when two matters touch the same people or situation, such as friendship and money, personal feelings and company rules, or work and private life. By repeating each item on both sides of 是 (shì), the speaker insists that each matter must be handled according to its own standards rather than blended together. Note that the HSK 4 label reflects the supplied syllabus outline rather than a guarantee about which exam version any individual test centre currently administers. 我们虽然关系好，但是朋友是朋友，生意是生意。 Wǒmen suīrán guānxì hǎo, dànshì péngyou shì péngyou, shēngyì shì shēngyì. Although we have a good relationship, friends are friends and business is business. A classic usage showing that personal friendship should not replace clear business terms. ## Sentence Structure and Word Choice The structure consists of two parallel clauses placed side by side. The first clause repeats the first concept (X) before and after 是, and the second clause repeats the second concept (Y) before and after 是. Noun / Matter X 是 Noun / Matter X ， Noun / Matter Y 是 Noun / Matter Y - X and Y name the two matters being separated. Nouns such as 朋友 and 生意 are common, but the items need not be two-syllable nouns: pronouns work in 你是你，我是我, and activities can be treated as matters in their own right. Choose natural, parallel expressions that suit the intended boundary. - The two items must be relevant to the same situation so that separating them actually matters in context. Pairing two completely unrelated objects like apples and tables does not produce a natural idiomatic sentence in normal conversation. - The two halves are tightly linked and usually separated by a comma, with no conjunction needed between them. 在他看来，工作是工作，生活是生活，不能混在一起。 Zài tā kànlái, gōngzuò shì gōngzuò, shēnghuó shì shēnghuó, bù néng hùn zài yīqǐ. In his view, work is work and life is life; they cannot be mixed together. Pairs two two-syllable nouns (工作 and 生活) and follows up with a clause explaining that they should not be blended. ## How It Works in Real Conversation In conversation, X是X ，Y是Y rarely stands completely alone without context. It frequently appears after a concession using 虽然 (suīrán, although) or after a transitional word like 但是 (dànshì, but) or 不过 (bùguò, however). The speaker first acknowledges the personal connection, sympathy, or relaxed mood, and then uses X是X ，Y是Y to pivot back to principle, duty, or boundaries. 我很同情你，不过感情是感情，规定是规定。 Wǒ hěn tóngqíng nǐ, bùguò gǎnqíng shì gǎnqíng, guīdìng shì guīdìng. I sympathize with you very much, but feelings are feelings and rules are rules. Follows an expression of personal sympathy with 不过 to draw a firm boundary around institutional rules. It is also common to follow the pattern with a concluding clause that spells out the practical consequence, such as saying the two things cannot be mixed up, or asking the listener to take the current task seriously. 玩笑是玩笑，正事是正事，现在大家认真一点。 Wánxiào shì wánxiào, zhèngshì shì zhèngshì, xiànzài dàjiā rènzhēn yīdiǎn. Joking is one thing and serious matters are another; everyone, be a little more serious now. Separates casual joking from important work to shift the mood of a group. ## Useful Contrast: Boundary-Setting vs. Single-Clause Concession The boundary-setting use here differs from a concession such as 贵是贵，但是…… (“It is expensive, but…”). Both repeat material around 是, so word shape or word class alone is not enough to tell their functions apart. Ask whether the speaker is separating matters or conceding one point before adding a reservation. - The full X是X，Y是Y model states both categories explicitly and emphasizes that they should be handled separately. - A single clause like 贵是贵 typically uses an adjective or verb to concede a point before introducing a reservation with 但是 (for example, acknowledging that something is indeed expensive, but still worth buying). - For practice, use both halves when you want to name both matters clearly. In context, a single statement such as 生意就是生意 can also set a boundary; it is not automatically a concession or an incomplete sentence. The complete pair makes the contrast explicit. If one half is omitted, listeners may still infer the other matter from the surrounding conversation. Judge the communicative function in context. ## Common Learner Mistake When learners try to express that two matters are separate, they sometimes cross-pair the nouns (saying X is Y, Y is X) or alter the identity statement. In Chinese, writing X是Y ，Y是X states that the two things are identical to each other—the exact opposite of keeping them apart. In a context where you are insisting on signing a formal contract despite being old friends, equating friendship with business makes the sentence self-contradictory. × 虽然我们认识很久了，但是朋友是生意，生意是朋友，今天还是要把合同签好。 Suīrán wǒmen rènshi hěn jiǔ le, dànshì péngyou shì shēngyì, shēngyì shì péngyou, jīntiān háishi yào bǎ hétong qiān hǎo. Incorrect: Although we have known each other for a long time, friends are business and business is friends, so today we still need to sign the contract properly. In this context, cross-pairing the nouns equates friendship with business, contradicting the intended boundary. The next example keeps each noun on both sides of its own 是 while retaining the contract and the existing friendship. Corrected example: 虽然我们认识很久了，但是朋友是朋友，生意是生意，今天还是要把合同签好。 虽然我们认识很久了，但是朋友是朋友，生意是生意，今天还是要把合同签好。 Suīrán wǒmen rènshi hěn jiǔ le, dànshì péngyou shì péngyou, shēngyì shì shēngyì, jīntiān háishi yào bǎ hétong qiān hǎo. Although we have known each other for a long time, friends are friends and business is business, so today we still need to sign the contract properly. Correct replacement: each noun is repeated on both sides of its own 是 to keep friendship and business in separate categories. ## Frequently asked questions **What kind of words can go into X and Y?** Use expressions that name the two matters you want to separate: 朋友/生意, 感情/规定 and 工作/生活 are common examples. Nouns are frequent, but pronouns and activities can also serve as the contrasted matters. There is no two-syllable requirement. **Does X是X ，Y是Y sound rude?** It is firm and direct because it sets a boundary, so it can sound blunt if used by itself. To keep the tone polite, speakers often soften it by first acknowledging the other person's feelings or relationship with a clause using 虽然 (although). **Does the order of X and Y matter?** Both orders are grammatical, but speakers usually put the already-mentioned or softer personal factor (such as 朋友 or 玩笑) in the X slot first, and place the stricter principle or current priority (such as 生意 or 正事) in the Y slot second. **Source**[hsk.cn-bj.ufileos.com · PDF page 396](https://hsk.cn-bj.ufileos.com/3.0/%E6%96%B0%E7%89%88HSK%E8%80%83%E8%AF%95%E5%A4%A7%E7%BA%B21219.pdf#page=396) ## Continue in the app Full mock exams are available in HSKReady. 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