Preposition: 因 (Because Of — Formal)
引出目的原因：因
Use the formal preposition 因 to concisely express reasons and causes in written Chinese
Place 因 directly before the reason or cause, followed by the result. Unlike 因为……所以, the standalone 因 is more concise and formal, often appearing without 所以.
因 is the compact, formal version of 因为. While 因为 is conversational and often paired with 所以, standalone 因 appears in formal writing, news reports, and official announcements. It is especially common in short, factual statements: 因病请假 (took leave due to illness), 因公出差 (traveling for business reasons).
Lesson Targets
Podcast
Podcast: Preposition: 因 (Because Of — Formal) (引出目的原因：因)
Listen to Jason & Amy explain the 引出目的原因：因 pattern
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Understanding 引出目的原因：因
You already know 因为……所以 as the standard "because…therefore" pattern. Now meet 因 — its elegant, concise formal counterpart. Where 因为 takes up space and sounds conversational, 因 is tight and efficient, perfect for news headlines, official notices, and formal writing. The phrase 因病请假 (took sick leave) packs "because of illness, requested leave" into just four characters — this compression is a hallmark of formal Chinese. You will see 因 constantly in written contexts: 因天气原因 (due to weather reasons), 因公出差 (business trip for work reasons), 因故取消 (canceled for reasons). Notice that 因 typically does not pair with 所以 — the result simply follows. This makes sentences feel crisp and professional. 因 also lives inside the compound 由于 (due to), which is another formal causal expression at HSK 6 level.
Key Points
- 因 (yīn) = "because of / due to" — concise, formal preposition.
- More compact than 因为, and does not require 所以.
- Very common in set phrases: 因病 (due to illness), 因公 (for official business), 因故 (for some reason).
- Standard in news and announcements: 因天气原因，航班取消 (Due to weather, the flight is canceled).
- Related compounds: 因为, 由于, 因此 (therefore), 原因 (reason/cause).
- Can introduce both noun phrases and short clauses as reasons.
- Creates a formal, professional tone — avoid in casual conversation.
The ability to express cause and reason concisely is highly valued in Chinese professional and academic writing. Notices, announcements, and news reports favor 因 over 因为 precisely because of its brevity. When you write 因故未能出席 (unable to attend due to reasons) instead of 因为有事所以没去, you sound professional and respectful of the reader's time.
Key Vocabulary
Example Sentences
因公司的业务需要，她要去中国出差。
Due to the company's business needs, she has to go to China on a business trip.
昨天她因病请假。
Yesterday she took leave due to illness.
Set phrase — very common
他因出门太晚迟到了。
He was late because he left home too late.
因天气原因，今天的比赛取消了。
Due to weather conditions, today's match has been canceled.
News announcement style
他因工作表现优秀被提升了。
He was promoted due to his excellent work performance.
因时间有限，我们只讨论了两个问题。
Due to limited time, we only discussed two issues.
她因故未能出席今天的会议。
She was unable to attend today's meeting due to personal reasons.
Politely vague — 因故 does not specify the reason
Common Mistakes
If you use 所以, pair it with 因为 (conversational). If you use 因 (formal), drop the 所以 and keep the sentence compact.
Casual complaints use 因为. Formal 因 works best with formal vocabulary — match the register throughout the sentence.
Practice Exercises
Tips & Tricks
Learn the three-character set phrases: 因病 (illness), 因公 (business), 因故 (reasons) — these are building blocks of formal Chinese.
In formal writing, 因 replaces 因为 and stands alone without 所以. This makes sentences tighter and more professional.
When you see 因 in news Chinese, it almost always means "due to" — recognizing it speeds up reading comprehension.
Pair 因 with formal result markers: 因……而 (due to…and therefore), 因……被 (due to…was).
Homework
Write a formal notice (通知) about a schedule change, using 因 to explain the reason at least twice. Then write three sentences using the set phrases 因病, 因公, and 因故.