Explaining 'Why': Emphasizing Reasons (之所以...是因为...)
Grammar Rule in 30 Seconds
Use '之所以...是因为...' to highlight the reason behind a specific outcome or event.
- Place '之所以' before the result: 之所以 {他|tā} {迟到|chídào}...
- Place '是因为' before the reason: ...是因为 {他|tā} {睡过头|shuìguòtóu} {了|le}。
- Never use '因为' alone if you start with '之所以' in this specific structure.
Overview
The Chinese correlative conjunction pattern 之所以...是因为... (zhīsuǒyǐ...shìyīnwèi...) serves a crucial function in discourse: it explicitly states a known result or phenomenon before providing its underlying reason. Unlike the more straightforward 因为...所以... (yīnwèi...suǒyǐ...), which typically introduces the cause first, 之所以...是因为... reverses this order. This structure topicalizes the outcome, prompting the listener or reader to anticipate the explanation that follows.
At the B1 CEFR level, mastering this pattern significantly enhances your ability to articulate complex logical connections, moving beyond simple cause-and-effect statements to more sophisticated explanations and justifications.
Historically, 之所以 derives from classical Chinese, where 之 (zhī) acts as a structural particle similar to 's or 的, and 所 (suǒ) refers to the object of an action. Together, 之所以 originally meant something like "the means by which" or "the reason for which." In modern Chinese, it has evolved into a fixed phrase introducing the effect. This structure is often used in formal writing, academic discussions, professional communications, and when you want to lend greater weight and clarity to your reasoning.
Consider the difference: If you simply state 因为下雨，所以我没去 (yīnwèi xiàyǔ, suǒyǐ wǒ méi qù – Because it rained, I didn't go), you present a linear progression from cause to effect. With 我之所以没去，是因为下雨了 (wǒ zhīsuǒyǐ méi qù, shìyīnwèi xiàyǔ le – The reason I didn't go is because it rained), you first establish the fact of not going, then provide the justification. This subtle shift in emphasis makes your explanation more impactful and demonstrates a higher level of linguistic control.
How This Grammar Works
之所以 literally translates to "the reason why" or "that by which." It marks the event or state that requires an explanation. Following this, 是因为 explicitly introduces the explanation itself, meaning "is because" or "is due to."之所以...是因为... satisfies a listener's natural curiosity. When an outcome is already known or has been stated, the immediate question is "Why?" This structure directly answers that implicit question. It guides the audience's attention, first presenting the established fact and then systematically revealing its underlying cause.他之所以成功，是因为他很努力 (tā zhīsuǒyǐ chénggōng, shìyīnwèi tā hěn nǔlì – The reason he succeeded is because he worked very hard). Here, the success (成功) is presented as a given, and the hard work (很努力) is identified as its direct cause.之所以...是因为..., you are not just listing facts; you are constructing a logical argument that clarifies the relationship between an event and its origins.是 (shì) in 是因为 is crucial. It functions as a copula, directly linking the stated result (之所以 clause) to its specific reason (是因为 clause). This linking makes the connection explicit and undeniable.是, the connection can feel less definitive or slightly awkward in formal settings, though sometimes omitted in very casual speech for brevity. 这项技术之所以重要，是因为它能改变未来 (zhè xiàng jìshù zhīsuǒyǐ zhòngyào, shìyīnwèi tā néng gǎibiàn wèilái – The reason this technology is important is because it can change the future) clearly shows how 是 solidifies the link between importance and future impact.Word Order Rules
之所以...是因为... pattern is relatively fixed, making it easier to learn and apply consistently. Understanding each component's placement is key to constructing grammatically correct and natural-sounding sentences.- Subject: This is the agent or entity undergoing the action or experiencing the result. While Chinese often allows subjects to be omitted when clear from context, including the subject at the beginning of this structure usually enhances clarity and formality. For example, in
他之所以迟到...(tā zhīsuǒyǐ chídào... – The reason he was late...),他(tā) is the subject.
- 之所以 (zhīsuǒyǐ): This phrase immediately follows the subject (if present) and precedes the Result/Effect. It signals that the following clause describes the outcome for which an explanation will be provided. It sets up the "why" question.
- Result/Effect: This is the event, action, or state that has occurred and needs to be explained. It forms the core of the first clause, expressing what happened. For example, in
...迟到，是因为...(...chídào, shìyīnwèi... – ...was late, is because...),迟到(chídào) is the result.
- 是因为 (shìyīnwèi): This pivotal phrase marks the transition from the stated result to its explanation. It literally means "is because" and directly introduces the reason. The
是here emphasizes the truth or certainty of the reason.
- Reason/Cause: This is the explanation for the Result/Effect. It clarifies why the outcome occurred. This clause typically completes the sentence. For example, in
...是因为交通堵塞(...shìyīnwèi jiāotōng dǔsè – ...is because of a traffic jam),交通堵塞(jiāotōng dǔsè) is the reason.
他 | tā |之所以 | zhīsuǒyǐ |成功 | chénggōng |是因为 | shìyīnwèi |\他很努力 | tā hěn nǔlì |Combined: 他之所以成功，是因为他很努力。 (tā zhīsuǒyǐ chénggōng, shìyīnwèi tā hěn nǔlì. – The reason he succeeded is because he worked hard.)
Formation Pattern
之所以...是因为... involves a clear, step-by-step process. Think of it as assembling logical components to form a coherent explanation. This pattern is particularly useful for presenting a conclusion first and then providing comprehensive justification.
之所以.
迟到 - chídào).
产品很快卖光了 - chǎnpǐn hěn kuài mài guāng le).
他 (tā – he).
这款新手机 (zhè kuǎn xīn shǒujī – this new phone).
之所以 + Result. This forms the first part of your sentence, stating the outcome that needs explaining.
他之所以迟到... (tā zhīsuǒyǐ chídào... – The reason he was late...)
这款新手机之所以很快卖光了... (zhè kuǎn xīn shǒujī zhīsuǒyǐ hěn kuài mài guāng le... – The reason this new phone sold out quickly...)
是因为.
交通堵塞 - jiāotōng dǔsè).
它有创新的功能 - tā yǒu chuàngxīn de gōngnéng).
是因为 + Reason. This forms the latter part of your sentence, providing the justification.
...是因为交通堵塞。 (...shìyīnwèi jiāotōng dǔsè. – ...is because of a traffic jam.)
...是因为它有创新的功能。 (...shìyīnwèi tā yǒu chuàngxīn de gōngnéng. – ...is because it has innovative features.)
他之所以迟到，是因为交通堵塞。 (tā zhīsuǒyǐ chídào, shìyīnwèi jiāotōng dǔsè. – The reason he was late is because of a traffic jam.)
这款新手机之所以很快卖光了，是因为它有创新的功能。 (zhè kuǎn xīn shǒujī zhīsuǒyǐ hěn kuài mài guāng le, shìyīnwèi tā yǒu chuàngxīn de gōngnéng. – The reason this new phone sold out quickly is because it has innovative features.)
是因为 is the most common and versatile, other options exist for varying degrees of formality or nuance:
是由于 (shìyóuyú): More formal and often used in written or academic contexts. It emphasizes that the reason is due to something, implying a slightly more objective or profound cause. 公司之所以成功，是由于全体员工的努力。 (gōngsī zhīsuǒyǐ chénggōng, shìyóuyú quán tǐ yuángōng de nǔlì. – The reason the company succeeded is due to the efforts of all employees.)
在于 (zàiyú): This option focuses on where the key point or essence of the reason lies. It's often used when pinpointing the most critical factor. 这本书之所以畅销，在于它深刻地揭示了人性。 (zhè běn shū zhīsuǒyǐ chàngxiāo, zàiyú tā shēnkè de jiēshì le rénxìng. – The reason this book is a bestseller lies in its profound revelation of human nature.)
是 is omitted in 是因为, the sentence becomes 之所以...因为.... This is more casual and less emphatic. While acceptable in informal speech, it's generally advisable for B1 learners to retain the 是 for clarity and grammatical correctness, especially in written form or formal spoken contexts.
When To Use It
之所以...是因为... effectively depends on your communicative intent and the context of your discussion. This pattern is not merely an alternative to 因为...所以...; it serves distinct pragmatic and rhetorical purposes. You should opt for this structure primarily when the result or outcome is already known, implied, or is the central topic of discussion, and your goal is to provide a comprehensive and emphasized explanation for that outcome.之所以...是因为... is the most appropriate choice:- Providing Justifications and Explanations: When someone asks "Why did X happen?" or when you anticipate this question, this pattern allows you to state the fact (X happened) and then systematically present the reason. It’s perfect for answering direct questions about causality or defending a position.
他之所以辞职，是因为找到了更好的发展机会。(tā zhīsuǒyǐ cízhí, shìyīnwèi zhǎodào le gèng hǎo de fāzhǎn jīhuì. – The reason he resigned is because he found a better development opportunity.)
- Formal and Academic Discourse: In essays, reports, presentations, or business communication,
之所以...是因为...adds a layer of professionalism and logical structure. It signals to your audience that you are presenting a well-reasoned argument, not just a simple statement. It helps in building a convincing narrative. 这次改革之所以取得成功，是因为我们充分听取了民意。(zhè cì gǎigé zhīsuǒyǐ qǔdé chénggōng, shìyīnwèi wǒmen chōngfèn tīngqǔ le mínyì. – The reason this reform succeeded is because we fully listened to public opinion.)
- Emphasizing the Reason: The structure places rhetorical weight on the reason by making the result the initial topic. This builds anticipation for the explanation. If you want your audience to focus intently on why something is the case, this is your pattern. It implies the reason is significant or complex.
这家餐厅之所以这么受欢迎，是因为它的菜品味道独特。(zhè jiā cāntīng zhīsuǒyǐ zhème shòu huānyíng, shìyīnwèi tā de càipǐn wèidào bútè. – The reason this restaurant is so popular is because its dishes have a unique flavor.)
- Responding to an Observed Fact: When you are commenting on a situation that is already evident or commonly understood, and you wish to provide the underlying cause, this pattern is natural. For instance, explaining why a particular policy was adopted, why a market trend occurred, or why a celebrity is famous.
她之所以看起来很疲惫，是因为她昨晚熬夜了。(tā zhīsuǒyǐ kàn qǐlái hěn píbeì, shìyīnwèi tā zuówǎn áoyè le. – The reason she looks so tired is because she stayed up late last night.)
- Deflecting or Mitigating: Sometimes, you might use this structure to explain an undesirable outcome, providing a justifiable reason that might mitigate blame or clarify circumstances. It allows you to present the negative fact and then offer an understandable cause.
我们之所以未能按时完成项目，是因为遇到了突发的技术难题。(wǒmen zhīsuǒyǐ wèi néng àn shí wánchéng xiàngmù, shìyīnwèi yùdào le tūfā de jìshù nántí. – The reason we couldn't complete the project on time is because we encountered unexpected technical difficulties.)
Common Mistakes
之所以...是因为.... Recognizing these pitfalls is crucial for avoiding awkward or ungrammatical constructions and sounding more natural in Chinese.- Confusing
因为...所以...with之所以...是因为...: This is the most prevalent error. Learners sometimes attempt to combine elements from both structures, leading to redundancy or incorrect emphasis. Remember, these patterns have inverted orders of emphasis. Do not use因为at the beginning of a sentence that also contains之所以. - Incorrect:
因为他很努力，他之所以成功，是因为他很努力。(This is highly redundant and ill-formed.) - Correct:
他之所以成功，是因为他很努力。(tā zhīsuǒyǐ chénggōng, shìyīnwèi tā hěn nǔlì.) OR因为他很努力，所以他成功了。(yīnwèi tā hěn nǔlì, suǒyǐ tā chénggōng le.)
- Incorrect Placement of Result and Reason: The
之所以clause must state the result/effect, and the是因为clause must state the reason/cause. Reversing these will make the sentence nonsensical. - Incorrect:
他很努力之所以，是因为他成功。(The grammar is scrambled; "worked hard" is a reason, not a result that needs further explanation in this context.) - Correct:
他之所以成功，是因为他很努力。(tā zhīsuǒyǐ chénggōng, shìyīnwèi tā hěn nǔlì.)
- Omitting
是in是因为in Formal Contexts: While之所以...因为...(without是) can be heard in casual speech, omitting是in formal writing or professional communication can make your sentence sound less definitive and grammatically less robust. For B1 learners, always including是is a safer and more consistently correct approach. - Less Formal/Potentially Awkward in Formal Contexts:
她之所以开心，因为得到了礼物。 - More Formal/Standard:
她之所以开心，是因为得到了礼物。(tā zhīsuǒyǐ kāixīn, shìyīnwèi dédào le lǐwù. – The reason she's happy is because she received a gift.)
- Overuse in Simple Explanations: This pattern carries a certain gravitas. Using it for trivial or self-evident reasons can sound unnatural or overly dramatic, akin to explaining "The reason I am eating is because I am hungry." Reserve it for situations where the reason genuinely requires emphasis or clarification.
- Awkward Overuse:
我之所以口渴，是因为我没喝水。(A simpler我没喝水，所以口渴了is more natural.) - Appropriate Use:
他之所以选择这份工作，是因为他看重工作与生活的平衡。(tā zhīsuǒyǐ xuǎnzé zhè fèn gōngzuò, shìyīnwèi tā kànzhòng gōngzuò yǔ shēnghuó de pínghéng. – The reason he chose this job is because he values work-life balance.)
- Misplacing the Subject: Although the subject often appears before
之所以, sometimes learners might insert it elsewhere, disrupting the flow. Ensure the subject clearly introduces the entire statement. - Incorrect:
之所以他很忙，是因为他有许多会议。(The subject他is more natural at the beginning.) - Correct:
他之所以很忙，是因为他有许多会议。(tā zhīsuǒyǐ hěn máng, shìyīnwèi tā yǒu xǔduō huìyì. – The reason he's busy is because he has many meetings.)
Contrast With Similar Patterns
之所以...是因为... is greatly enhanced by contrasting it with other related patterns in Chinese, particularly 因为...所以... (yīnwèi...suǒyǐ...) and 是...的 (shì...de) emphasis structures. While they all deal with causality or emphasis, their pragmatic functions differ significantly.因为...所以... (yīnwèi...suǒyǐ...) - Cause-Effect Relationship- Structure:
因为 [Cause]，所以 [Effect]。 - Emphasis: On the cause, leading to the effect.
- Usage: General statements of causality, explaining what resulted from what. Often used when both the cause and effect are new information or when you want to present the cause as the primary trigger.
- Example:
因为下雨了，所以我没去公园。(yīnwèi xiàyǔ le, suǒyǐ wǒ méi qù gōngyuán. – Because it rained, I didn't go to the park.)
因为...所以... vs. 之所以...是因为...因为...所以... | 之所以...是因为... |因为他努力，所以他成功了。(yīnwèi tā nǔlì, suǒyǐ tā tā chénggōng le. – Because he worked hard, he succeeded.) - Focus: His hard work led to success.他之所以成功，是因为他努力。(tā zhīsuǒyǐ chénggōng, shìyīnwèi tā nǔlì. – The reason he succeeded is because he worked hard.) - Focus: He succeeded (a known fact), and the reason for this success is his hard work.
是...的 (shì...de) - Emphasizing Details是...的 structure is used to emphasize a specific detail about an already completed action, such as the time, place, manner, or agent of the action. It doesn't explain why something happened in terms of underlying reasons, but how or when it happened.- Structure:
是 [Emphasized Detail] 的。 - Emphasis: On a specific circumstance of an action.
- Usage: To clarify or highlight a particular piece of information about a past event, often in response to a question or to correct a misunderstanding.
- Example:
我是昨天去公园的。(wǒ shì zuótiān qù gōngyuán de. – I went to the park yesterday [emphasizing time].)
之所以...是因为... focuses on the reason for an event, while 是...的 highlights details about an event. Do not confuse the 是 in 是因为 (which is part of a conjunction pair) with the 是 in the 是...的 structure (which functions to emphasize an element of a verb phrase).既然...就... (jìrán...jiù...) - Since... Then... (Inference/Suggestion)既然) and then draws a logical conclusion, makes a suggestion, or issues a command based on that fact (就). It focuses on logical inference rather than direct causation of a result.- Structure:
既然 [Known Fact/Premise]，就 [Conclusion/Suggestion/Action]。 - Emphasis: On the logical consequence or action derived from a premise.
- Usage: When you're building an argument, making a decision, or giving advice based on an established condition.
- Example:
既然你累了，就早点休息吧。(jìrán nǐ lèi le, jiù zǎodiǎn xiūxī ba. – Since you're tired, then rest early.)
之所以...是因为... and 既然...就... involve logical reasoning, the former explains the cause of a fact, while the latter states a consequence or action that follows from a fact. They operate on different types of logical connections.Real Conversations
之所以...是因为... is not confined to textbooks; it is widely used in modern Chinese communication, from formal settings to more nuanced casual exchanges. Its use often indicates a speaker's desire to provide a clear, well-thought-out explanation.
Scenario 1
User A
最近那部剧真的好火啊，朋友圈都在讨论！ (zuìjìn nà bù jù zhēnde hǎo huǒ a, péngyǒuquān dōu zài tǎolùn! – That drama is so popular recently, everyone on WeChat Moments is talking about it!)User B
那部剧之所以火，是因为它剧情紧凑，演员演技在线。 (nà bù jù zhīsuǒyǐ huǒ, shìyīnwèi tā jùqíng jǐncòu, yǎnyuán yǎnjì zài xiàn. – The reason that drama is popular is because its plot is fast-paced and the actors' performances are solid.)Scenario 2
Manager
我们为什么要调整这个项目的优先级？ (wǒmen wèishénme yào tiáozhěng zhège xiàngmù de yōuxiān jí? – Why are we adjusting the priority of this project?)Team Lead
这个项目之所以需要调整优先级，是因为市场环境发生了巨大变化，我们必须快速响应。 (zhège xiàngmù zhīsuǒyǐ xūyào tiáozhěng yōuxiān jí, shìyīnwèi shìchǎng huánjìng fāshēng le jùdà biànhuà, wǒmen bìxū kuàisù xiǎngyìng. – The reason this project needs a priority adjustment is because the market environment has undergone huge changes, and we must respond quickly.)Scenario 3
Friend
你怎么突然开始学古筝了？ (nǐ zěnme tūrán kāishǐ xué gǔzhēng le? – Why did you suddenly start learning guzheng?)You
我之所以选择学古筝，是因为我一直对传统文化很感兴趣，而且它能让我放松。 (wǒ zhīsuǒyǐ xuǎnzé xué gǔzhēng, shìyīnwèi wǒ yīzhí duì chuántǒng wénhuà hěn gǎnxìngqù, érqiě tā néng ràng wǒ fàngsōng. – The reason I chose to learn guzheng is because I've always been very interested in traditional culture, and it helps me relax.)Scenario 4
Teacher
你觉得小明这次考试进步这么大，原因是什么？ (nǐ juéde xiǎomíng zhè cì kǎoshì jìnbù zhème dà, yuányīn shì shénme? – What do you think is the reason Xiaoming made such great progress in this exam?)Student
小明之所以进步这么大，是因为他改变了学习方法，并且每天都坚持练习。 (xiǎomíng zhīsuǒyǐ jìnbù zhème dà, shìyīnwèi tā gǎibiàn le xuéxí fāngfǎ, bìngqiě měitiān dōu jiānchí liànxí. – The reason Xiaoming made such great progress is because he changed his study methods and persisted in practicing every day.)These examples demonstrate how 之所以...是因为... allows speakers to present a known fact or observation and then follow it with a clear, impactful explanation, making their communication more structured and persuasive. This pattern reflects a cultural inclination towards presenting arguments clearly and logically, often building up to the core explanation.
Quick FAQ
之所以...是因为... to solidify your understanding.之所以...是因为... for negative outcomes or non-occurrences?- Example:
我之所以没去参加派对，是因为我生病了。(wǒ zhīsuǒyǐ méi qù cānjiā pàiduì, shìyīnwèi wǒ shēngbìng le. – The reason I didn't go to the party is because I was sick.) - Example:
公司之所以亏损，是因为管理不善。(gōngsī zhīsuǒyǐ kuīsǔn, shìyīnwèi guǎnlǐ bùshàn. – The reason the company suffered losses is because of poor management.)
之所以?- Example (Subject omitted, acceptable if context is clear):
之所以选择这里，是因为风景优美。(zhīsuǒyǐ xuǎnzé zhèlǐ, shìyīnwèi fēngjǐng yōuměi. – The reason [we] chose here is because the scenery is beautiful.)
是 be omitted from 是因为?是 can sometimes be omitted, resulting in 之所以...因为.... However, 之所以...是因为... is considered more complete and formal. For written Chinese, academic contexts, or when you want to make a clear, definitive statement, retaining 是 is always preferred.是因为 with multiple reasons, typically connected by conjunctions like 而且 (érqiě – moreover), 此外 (cǐwài – in addition), or simply by listing them. The structure establishes that these are the reasons.- Example:
他之所以受到尊重，是因为他诚实守信，而且乐于助人。(tā zhīsuǒyǐ shòudào zūnzhòng, shìyīnwèi tā chéngshí shǒuxìn, érqiě lèyú zhùrén. – The reason he is respected is because he is honest and trustworthy, and he is willing to help others.)
之所以...是因为... suitable for hypothetical situations or future events?如果...那么... (rúguǒ...nàme...将来会因为...所以... (jiānglái huì yīnwèi...suǒyǐ... – in the future, because...之所以 implies an established effect needing explanation.- Example (Positive):
她之所以成功，是因为她付出了巨大的努力。(tā zhīsuǒyǐ chénggōng, shìyīnwèi tā fùchū le jùdà de nǔlì. – The reason she succeeded is because she put in tremendous effort.) - Example (Negative):
他之所以失败，是因为他没有认真准备。(tā zhīsuǒyǐ shībài, shìyīnwèi tā méiyǒu rènzhēn zhǔnbèi. – The reason he failed is because he didn't prepare seriously.)
Structure Breakdown
| Part | Function | Example |
|---|---|---|
|
Subject
|
The person/thing
|
他
|
|
之所以
|
Result marker
|
之所以
|
|
Result
|
The outcome
|
迟到
|
|
是因为
|
Reason marker
|
是因为
|
|
Reason
|
The cause
|
睡过头了
|
Common Variations
| Full Form | Shortened Form |
|---|---|
|
之所以...是因为...
|
之所以...是...
|
|
之所以...是因为...
|
之所以...因为...
|
Meanings
This structure is used to emphasize the reason for a previously mentioned or implied result. It translates roughly to 'The reason why... is because...'.
Emphasizing Causality
Focusing the listener's attention on the specific cause of a situation.
“{他|tā} {之所以|zhīsuǒyǐ} {成功|chénggōng}，{是|shì} {因为|yīnwèi} {他|tā} {很|hěn} {努力|nǔlì}。”
“{这|zhè} {个|gè} {项目|xiàngmù} {之所以|zhīsuǒyǐ} {失败|shībài}，{是|shì} {因为|yīnwèi} {准备|zhǔnbèi} {不足|bùzú}。”
Reference Table
| Form | Structure | Example |
|---|---|---|
|
Affirmative
|
Subj + 之所以 + Result + 是因为 + Reason
|
他之所以成功是因为努力。
|
|
Negative
|
Subj + 之所以 + Result + 不是因为 + Reason
|
他之所以失败不是因为没努力。
|
|
Question
|
Subj + 之所以 + Result + 是因为 + Reason + 吗?
|
他之所以成功是因为努力吗?
|
|
Shortened
|
Subj + 之所以 + Result + 是 + Reason
|
他之所以成功是努力。
|
Formality Spectrum
本人之所以迟到，是因为睡过头了。 (Explaining lateness)
我之所以迟到，是因为我睡过头了。 (Explaining lateness)
我迟到是因为我睡过头了。 (Explaining lateness)
我迟到是因为睡过头。 (Explaining lateness)
Causal Flow
Result
- 迟到 late
Reason
- 睡过头 overslept
Examples by Level
{我|wǒ} {之所以|zhīsuǒyǐ} {来|lái} {这里|zhèlǐ}，{是|shì} {因为|yīnwèi} {你|nǐ}。
The reason I came here is because of you.
{他|tā} {之所以|zhīsuǒyǐ} {笑|xiào}，{是|shì} {因为|yīnwèi} {开心|kāixīn}。
The reason he is laughing is because he is happy.
{这|zhè} {之所以|zhīsuǒyǐ} {好|hǎo}，{是|shì} {因为|yīnwèi} {新|xīn}。
The reason this is good is because it is new.
{我|wǒ} {之所以|zhīsuǒyǐ} {走|zǒu}，{是|shì} {因为|yīnwèi} {晚|wǎn} {了|le}。
The reason I am leaving is because it is late.
{我|wǒ} {之所以|zhīsuǒyǐ} {学|xué} {中文|zhōngwén}，{是|shì} {因为|yīnwèi} {我|wǒ} {想|xiǎng} {去|qù} {中国|zhōngguó} {旅游|lǚyóu}。
The reason I study Chinese is because I want to travel to China.
{他|tā} {之所以|zhīsuǒyǐ} {没|méi} {来|lái}，{是|shì} {因为|yīnwèi} {他|tā} {生病|shēngbìng} {了|le}。
The reason he didn't come is because he got sick.
{这|zhè} {个|gè} {菜|cài} {之所以|zhīsuǒyǐ} {辣|là}，{是|shì} {因为|yīnwèi} {放|fàng} {了|le} {很多|hěnduō} {辣椒|làjiāo}。
The reason this dish is spicy is because it has a lot of chili.
{我|wǒ} {之所以|zhīsuǒyǐ} {买|mǎi} {这|zhè} {个|gè}，{是|shì} {因为|yīnwèi} {它|tā} {很|hěn} {便宜|piányí}。
The reason I bought this is because it is cheap.
{我|wǒ} {之所以|zhīsuǒyǐ} {选择|xuǎnzé} {这|zhè} {份|fèn} {工作|gōngzuò}，{是|shì} {因为|yīnwèi} {它|tā} {提供|tígōng} {很|hěn} {好|hǎo} {的|de} {发展|fāzhǎn} {机会|jīhuì}。
The reason I chose this job is because it offers great development opportunities.
{他|tā} {之所以|zhīsuǒyǐ} {能|néng} {成功|chénggōng}，{是|shì} {因为|yīnwèi} {他|tā} {从不|cóngbù} {放弃|fàngqì}。
The reason he succeeded is because he never gives up.
{这|zhè} {个|gè} {城市|chéngshì} {之所以|zhīsuǒyǐ} {这么|zhème} {受欢迎|shòuhuānyíng}，{是|shì} {因为|yīnwèi} {它|tā} {有|yǒu} {悠久|yōujiǔ} {的|de} {历史|lìshǐ}。
The reason this city is so popular is because it has a long history.
{我|wǒ} {之所以|zhīsuǒyǐ} {生气|shēngqì}，{是|shì} {因为|yīnwèi} {你|nǐ} {没有|méiyǒu} {告诉|gàosù} {我|wǒ} {真相|zhēnxiàng}。
The reason I am angry is because you didn't tell me the truth.
{这|zhè} {项|xiàng} {政策|zhèngcè} {之所以|zhīsuǒyǐ} {引起|yǐnqǐ} {争议|zhēngyì}，{是|shì} {因为|yīnwèi} {它|tā} {影响|yǐngxiǎng} {了|le} {许多|xǔduō} {人|rén} {的|de} {利益|lìyì}。
The reason this policy caused controversy is because it affected many people's interests.
{他|tā} {之所以|zhīsuǒyǐ} {能|néng} {写出|xiěchū} {这么|zhème} {好|hǎo} {的|de} {文章|wénzhāng}，{是|shì} {因为|yīnwèi} {他|tā} {阅读|yuèdú} {了|le} {大量|dàliàng} {的|de} {书籍|shūjí}。
The reason he could write such a good article is because he read a lot of books.
{这|zhè} {种|zhǒng} {现象|xiànxiàng} {之所以|zhīsuǒyǐ} {存在|cúnzài}，{是|shì} {因为|yīnwèi} {社会|shèhuì} {环境|huánjìng} {的|de} {变化|biànhuà}。
The reason this phenomenon exists is because of changes in the social environment.
{我|wǒ} {之所以|zhīsuǒyǐ} {坚持|jiānchí} {下去|xiàqù}，{是|shì} {因为|yīnwèi} {我|wǒ} {相信|xiāngxìn} {未来|wèilái} {会|huì} {更好|gènghǎo}。
The reason I kept going is because I believe the future will be better.
{这|zhè} {种|zhǒng} {文化|wénhuà} {现象|xiànxiàng} {之所以|zhīsuǒyǐ} {在|zài} {全球|quánqiú} {范围|fànwéi} {内|nèi} {流行|liúxíng}，{是|shì} {因为|yīnwèi} {互联网|hùliánwǎng} {的|de} {全球化|quánqiúhuà} {传播|chuánbō} {作用|zuòyòng}。
The reason this cultural phenomenon is popular globally is because of the global dissemination role of the internet.
{他|tā} {之所以|zhīsuǒyǐ} {能|néng} {在|zài} {危机|wēijī} {中|zhōng} {脱颖而出|tuōyǐng'érchū}，{是|shì} {因为|yīnwèi} {他|tā} {具备|jùbèi} {卓越|zhuóyuè} {的|de} {领导力|lǐngdǎolì}。
The reason he was able to stand out during the crisis is because he possesses excellent leadership.
{这|zhè} {个|gè} {理论|lǐlùn} {之所以|zhīsuǒyǐ} {被|bèi} {广泛|guǎngfàn} {接受|jiēshòu}，{是|shì} {因为|yīnwèi} {它|tā} {具有|jùyǒu} {很|hěn} {强|qiáng} {的|de} {解释力|jiěshìlì}。
The reason this theory is widely accepted is because it has strong explanatory power.
{我|wǒ} {之所以|zhīsuǒyǐ} {对|duì} {这|zhè} {个|gè} {问题|wèntǐ} {如此|rúcǐ} {关注|guānzhù}，{是|shì} {因为|yīnwèi} {它|tā} {直接|zhíjiē} {关系|guānxì} {到|dào} {我们|wǒmen} {的|de} {未来|wèilái}。
The reason I am so concerned about this issue is because it directly relates to our future.
{这|zhè} {一|yī} {历史|lìshǐ} {事件|shìjiàn} {之所以|zhīsuǒyǐ} {被|bèi} {后人|hòurén} {铭记|míngjì}，{是|shì} {因为|yīnwèi} {它|tā} {深刻|shēnkè} {地|de} {改变|gǎibiànbiàn} {了|le} {社会|shèhuì} {的|de} {进程|jìnchéng}。
The reason this historical event is remembered by posterity is because it profoundly changed the course of society.
{他|tā} {之所以|zhīsuǒyǐ} {能|néng} {在|zài} {艺术|yìshù} {领域|lǐngyù} {取得|qǔdé} {如此|rúcǐ} {成就|chéngjiù}，{是|shì} {因为|yīnwèi} {他|tā} {对|duì} {传统|chuántǒng} {的|de} {深刻|shēnkè} {理解|lǐjiě} {与|yǔ} {创新|chuàngxīn} {精神|jīngshén}。
The reason he achieved such success in the field of art is because of his profound understanding of tradition and spirit of innovation.
{这|zhè} {种|zhǒng} {语言|yǔyán} {现象|xiànxiàng} {之所以|zhīsuǒyǐ} {在|zài} {方言|fāngyán} {中|zhōng} {保留|bǎoliú} {下来|xiàlái}，{是|shì} {因为|yīnwèi} {地理|dìlǐ} {环境|huánjìng} {的|de} {封闭性|fēngbìxìng}。
The reason this linguistic phenomenon has been preserved in dialects is because of the isolation of the geographical environment.
{我|wǒ} {之所以|zhīsuǒyǐ} {如此|rúcǐ} {执着|zhízhuó}，{是|shì} {因为|yīnwèi} {我|wǒ} {深知|shēnzhī} {成功|chénggōng} {背后|bèihòu} {的|de} {艰辛|jiānxīn}。
The reason I am so persistent is because I deeply understand the hardships behind success.
Easily Confused
Both express causality, but the order is different.
Both are formal causal structures.
Learners mix purpose with cause.
Common Mistakes
因为他迟到，所以他迟到。
他之所以迟到，是因为他睡过头了。
之所以他迟到，因为他睡过头。
他之所以迟到，是因为他睡过头了。
因为他睡过头，所以他之所以迟到。
他之所以迟到，是因为他睡过头了。
他迟到，是因为他之所以睡过头。
他之所以迟到，是因为他睡过头了。
之所以我喜欢，是因为好。
我之所以喜欢它，是因为它很好。
他之所以没来，因为他病了。
他之所以没来，是因为他病了。
是因为他病了，所以他之所以没来。
他之所以没来，是因为他病了。
之所以这个项目失败，是因为准备不足。
这个项目之所以失败，是因为准备不足。
他之所以成功，是因为他努力。
他之所以成功，是因为他很努力。
之所以这样，是因为那样。
之所以会这样，是因为那样。
之所以导致失败，是因为准备不足。
项目之所以失败，是因为准备不足。
之所以是这样，是因为那样。
之所以会这样，是因为那样。
之所以他成功，是因为他努力。
他之所以成功，是因为他很努力。
Sentence Patterns
___之所以___，是因为___。
之所以___，是因为___。
___之所以___，是因为___。
___之所以___，是因为___。
Real World Usage
我之所以申请这份工作，是因为我对这个领域很感兴趣。
这个理论之所以被广泛接受，是因为它具有很强的解释力。
我之所以决定辞职，是因为我想追求自己的梦想。
我之所以没回你，是因为我刚才在开会。
我之所以投诉，是因为你们的服务太差了。
这个城市之所以迷人，是因为它独特的文化氛围。
Focus on the Result
Avoid Repetition
Use for Emphasis
Formal Tone
Smart Tips
Start with '之所以' to show you have a clear reason.
Use this to justify your proposals.
Use it to introduce your main argument.
Use it to provide a structured answer.
Pronunciation
Emphasis
Emphasize '之所以' to show you are about to give a logical explanation.
Logical pause
Subject + 之所以 + [Pause] + Result + 是因为 + Reason
The pause highlights the result.
Memorize It
Mnemonic
Think of '之所以' as the 'Result' hook and '是因为' as the 'Reason' anchor.
Visual Association
Imagine a scale. On the left side, you place the 'Result' (the event). On the right side, you place the 'Reason' (the cause). The word '之所以' holds the left, and '是因为' holds the right.
Rhyme
Result first with 之所以, Reason follows with 是因为.
Story
Xiao Wang was late for work. He said, 'The reason I am late (之所以迟到) is because my alarm didn't ring (是因为闹钟没响)'. He used the structure to explain his situation perfectly.
Word Web
Challenge
Write three sentences about your day using this structure in 5 minutes.
Cultural Notes
Used frequently in formal speeches and academic settings to show logical rigor.
Similar usage, often appears in news reporting and formal interviews.
Used in formal written Chinese, though spoken Cantonese often uses different causal markers.
The structure evolved from classical Chinese patterns where '之' acted as a nominalizer.
Conversation Starters
你为什么学中文？
你为什么喜欢这个城市？
你为什么选择这份工作？
你为什么认为这个理论很重要？
Journal Prompts
Common Mistakes
Test Yourself
___他迟到，___他睡过头了。
Which sentence is correct?
Find and fix the mistake:
因为他没来，所以他之所以生病了。
Arrange the words in the correct order:
All words placed
Click words above to build the sentence
The reason I am happy is because I passed the exam.
Answer starts with: a...
A: 你为什么辞职？ B: ___
Use '之所以' and '是因为' to explain why you like Chinese.
Match each item on the left with its pair on the right:
Score: /8
Practice Exercises
8 exercises___他迟到，___他睡过头了。
Which sentence is correct?
Find and fix the mistake:
因为他没来，所以他之所以生病了。
成功 / 他 / 之所以 / 努力 / 是因为
The reason I am happy is because I passed the exam.
A: 你为什么辞职？ B: ___
Use '之所以' and '是因为' to explain why you like Chinese.
Result: 他迟到了. Reason: 闹钟没响.
Score: /8
Practice Bank
10 exercisesThe reason I am late is because there was a traffic jam.
Select the best option:
Match the pairs:
Arrange these words:
这首歌___火，是因为它的旋律很好听。
之所以我学习是因为我想进步。
The reason why he left is because he was tired.
Which is more structured?
他之所以成功，___他从不放弃。
Match correctly:
Score: /10
FAQ (8)
In casual speech, yes, but '是因为' is more standard and emphasizes the 'is' (是) copula.
Usually, yes. '他之所以...' is standard.
It is neutral to formal. It's great for essays and professional talk.
Yes, '他之所以没来，是因为...' works perfectly.
You can, but '之所以...是因为...' emphasizes the result more.
Yes, but it might sound a bit serious.
Then you are just using a normal '因为' sentence, which is fine but less emphatic.
Yes, '你之所以这样做，是因为...吗?'
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
The reason why... is because...
Chinese is more rigid in its correlative pairing.
La razón por la cual... es porque...
Spanish speakers often prefer simple 'porque' clauses.
La raison pour laquelle... est que...
French uses 'que' instead of 'parce que' after 'est'.
Der Grund, warum... ist, weil...
German requires a specific verb position in the 'weil' clause.
〜の理由は〜だからです
Japanese uses particles like 'no' and 'kara'.
السبب في... هو أن...
Arabic uses 'anna' (that) to introduce the reason clause.
Learning Path
Prerequisites
Related Videos
Related Grammar Rules
Having things and 'There is' ({有|yǒu})
Overview In Chinese, the character `{有|yǒu}` is a foundational verb with two primary functions: expressing **possession...
Emphasizing Details with 是...的 (shì...de)
Overview The `是...的 (shì...de)` construction is a fundamental Chinese grammar pattern. It acts as a linguistic spotlig...
Explaining the 'Why' (之所以...是因为...)
Overview At the B2 level, you have likely mastered the fundamental cause-and-effect pattern `因为...所以...` (yīnwèi......
Formal Topic-Comment Structures: Guanyu, Zhiyu, and Lun (关于、至于、论)
Overview In English, we structure sentences around a subject performing an action: "**The team** will discuss **the bud...
Pivotal Constructions: Ask Him to Come (请你帮我, 让他来)
In a pivotal construction, the object of the first verb is also the subject of the second verb. Pattern: Subject1 + V1 +...
