Conjunctions / 连词

HSK 4 因为 vs 由于

Q: How is 因为 vs 由于 tested in HSK 4?

Three places: (1) 阅读 Part 1 选词填空 — 由于 is the literal answer in Test 06 Q49 and Test 08 Q50 with the 由于天气原因 collocation; (2) 阅读 Part 2 排列顺序 where 因为…所以 and 由于…因此 lock clause order; (3) 阅读 Part 3 reading where the marker tells you the register.

Q: What's the quickest way to remember 因为 vs 由于?

Five-second decision tree: (1) Standalone reply to 为什么 → 因为. (2) Cause is a bare noun phrase → 由于. (3) Cleft 是…的 / 之所以… → 因为. (4) Pairs with 因此/因而 → 由于. (5) Reason in clause 2 → 因为. Otherwise 因为 is the safe default.

Q: Can I always say 由于…所以…?

Yes, grammatical. But the polished formal pairing is 由于…因此…/由于…因而…. In HSK 4 reading, treat 因此 / 因而 as a 由于-family signal. Never use 由于…才… or 由于…就….

Q: What about 因为 + noun phrase like 因为天气?

Bare 因为 + noun is awkward. Spoken Chinese expands it to 因为天气的关系 or 因为天气不好. For a clean noun-only cause (天气原因, 种种原因), 由于 is the natural choice. On HSK 4 fill-in-the-blank, if the blank is followed directly by a noun + comma, the answer is almost always 由于.

because (informal/spoken) vs due to (formal/written) — same meaning, different register

Core Comparison / 对比

因为 yīnwèi		由于 yóuyú
Register	Spoken & written, neutral	Formal — writing, news, official notices
Pairing	因为…所以… (most common) 因为…才/就… (also OK)	由于…因此/因而… (formal) 由于…所以… (also OK) ⚠ Never 由于…才/就…
Position	First clause OR second clause: 因为下雨，所以没去 ✓ 我没去，因为下雨 ✓	Almost always first clause: 由于下雨，所以没去 ✓ 我没去，由于下雨 ✗
Standalone reply	A：为什么？B：因为太贵了 ✓	A：为什么？B：由于太贵了 ✗
+ Noun phrase	因为 + 名词 is rare — usually adds 的关系: 因为工作的关系	由于 + 名词 is the typical formal use: 由于天气原因、由于种种原因、由于工作需要
Cleft structure	是因为 / 之所以…是因为…: 我没去是因为下雨了	之所以…由于 doesn't form a fixed cleft pattern at HSK 4 level

Six HSK 4 Patterns / 六个常考用法

HSK 4 reading tests these six structures. Memorize the shape, not just the gloss.

因为 · Pattern 1

因为…所以… — most common pair

因为下雨，所以比赛取消了。
It rained, so the match was cancelled.

因为 · Pattern 2

…，因为… — reason in second clause

我喜欢这份报纸，因为它的内容丰富。
I like this paper because the content is rich.

由于 cannot move into the second clause.

因为 · Pattern 3

是因为… — cleft / emphasis

他不来是因为他生病了。
The reason he isn't coming is that he's sick.

Also: 之所以 X 是因为 Y. 由于 never replaces 因为 here.

由于 · Pattern 4

由于 + 名词 — the formal default

由于天气原因，航班推迟了。
Due to the weather, the flight was delayed.

Fixed phrases: 由于天气原因、由于种种原因、由于工作需要.

由于 · Pattern 5

由于 + 完整句 — full clause

由于没好好复习，今天考得不怎么样。
Because I didn't review properly, I didn't do well today.

First clause only — never trailing.

由于 · Pattern 6

由于…因此/因而… — formal pair

由于气候不同，因此南北差别很大。
Because of climate differences, north and south differ greatly.

In HSK 4 reading, 因此 is a strong signal that the cause clause came first.

Examples / 例句

因为: 因为下雨，所以我没去公园。

Yīnwèi xià yǔ, suǒyǐ wǒ méi qù gōngyuán.

Because it was raining, I didn't go to the park.

由于: 由于天气原因，今天的航班取消了。

Yóuyú tiānqì yuányīn, jīntiān de hángbān qǔxiāo le.

Due to the weather, today's flight has been cancelled.

Quick decision tree: (1) Standalone reply to "为什么"? → 因为. (2) First clause + noun phrase like 天气原因/工作需要/种种原因? → 由于. (3) Cleft (是…的) emphasis? → 因为. (4) Pairs with 因此/因而? → 由于. (5) Otherwise, neutral / spoken? → 因为 is safe.

⚠ Common Errors / 常见错误

❌ 我没去，由于堵车。 (由于 in clause 2)	✓ 我没去，因为堵车。 / 由于堵车，我没去。
❌ 由于他来晚了，就被批评了。 (由于…就)	✓ 因为他来晚了，就被批评了。 / 由于他来晚了，因此被批评了。
❌ A：为什么不来？B：由于太忙了。	✓ A：为什么不来？B：因为太忙了。 (standalone reply)
❌ 之所以努力，是由于想成功。	✓ 之所以努力，是因为想成功。 (cleft locks 因为)
❌ 由于…所以是最自然的。	✓ 由于…因此/因而… is the polished formal pair (由于…所以 is OK but mixes registers)

由于's grammar is narrower than 因为's. When in doubt, 因为 is safer; choose 由于 only when the shape fits (clause 1 + noun phrase / formal register).

💡 Why English speakers struggle with this pair

English "because" doesn't carry register information — you'd use the same word in a text to a friend and in an academic paper, and just change everything around it. Chinese splits the work: 因为 is the all-purpose word, while 由于 is a marked formal variant with narrower grammar (no trailing position, no standalone reply, prefers a noun phrase). So the problem isn't that 因为 and 由于 "mean the same thing" — it's that one is grammatically flexible and one isn't. Treat 由于 as a restricted-use word, not as a synonym for 因为. That mental flip resolves most errors.

Fill in the Blank / 填空练习

Type the correct word to complete each sentence. Press Enter or click Check.

身体不舒服，他没来上班。

你的帮助，我才能完成这个项目。

我没去看电影，我没买到票。

天气原因，飞往首都的航班改在8点半起飞。

他不来他生病了，明天就会回来。

气候不同，因此南北方的风景差别很大。

Quick Quiz / 小测验

A: 你为什么迟到？
B: 堵车。

由于 cannot stand alone as a reply to 为什么. Only 因为 (or just 堵车 itself) works.

交通堵塞，会议被迫推迟到明天。

Formal news-register sentence with passive 被迫 — 由于 fits. 因为 isn't wrong, but 由于 is the marked formal choice the test expects.

他生病了，所以请了假。

Conversational tone — and 由于 + S + V is grammatical but rare here. 因为…所以 is the natural everyday pair.

种种原因，她最后没能成为一名警察。

由于 + 名词 (种种原因) is the marked formal collocation. 因为种种原因 is grammatical and not uncommon in speech, but in written/formal context (the test's register) 由于 is the stylistically polished pick. (Adapted from Test 04 Q64.)

他之所以坚持跑步，是医生说这样能减肥。

之所以…是因为… is a fixed cleft structure. 是由于 is grammatical in general writing, but the locked HSK 4 pattern is 之所以…是因为….

Where 因为 / 由于 Appear in Real HSK 4 / 真题示例

Five genuine mock-exam items where 因为, 由于 or their formal counterpart 因此 is the key grammatical signal — including two 选词填空 (Part 1) items where 由于 is the literal correct answer:

由于 + 名词 · From Mock Test 06 · Q49

阅读 Part 1 选词填空

（　）天气原因，学校推迟了羽毛球比赛时间。

A 及时B 钥匙C 回忆D 坚持E 适合F 由于 ✓

由于 + 名词短语 (天气原因) is the classic formal-cause shape. 因为天气原因 is rarer — formal contexts default to 由于.

由于 + 名词 · From Mock Test 08 · Q50

阅读 Part 1 选词填空

（）天气原因，飞往首都的航班改在8点半起飞。

A 观众B 由于 ✓C 职业D 坚持E 抱歉F 乱

Same fixed collocation — 由于天气原因. The exam keeps reusing this shape because it cleanly separates 由于 from 因为.

由于 + 完整句 · From Mock Test 11 · Q68

阅读 reading comprehension

由于没好好复习，今天考得不怎么样。有几个填空题不会做，有几个选择题，实在想不出来该选哪个…
问：这次考试，我：

由于 attaches to a full clause (没好好复习) in first position — note the trailing comma. If this same sentence had said "今天考得不怎么样，由于没好好复习," it would be wrong: 由于 doesn't trail.

因为 in clause 2 · From Mock Test 07 · Q61

阅读 reading comprehension

我父亲是一名医生，工作非常忙。他经常加班…虽然他很辛苦，但是他从来不抱怨，因为他热爱自己的工作。

因为 sits in the second clause as a trailing reason — a position 由于 cannot fill. This is one of the cleanest tells in HSK 4 reading.

因此 (formal linker) · From Mock Test 03 · Q84

阅读 reading comprehension

中国南北距离约5500公里，因此南北气候有很大区别。南方很多地方的冬天一点儿也不冷…

因此 is the formal "so / therefore" that pairs with 由于. When 因此 starts the result clause, the cause clause typically used 由于 (or an implied formal context). Treat 因此 as a 由于-family signal.

因为 vs 由于 FAQ

Are 因为 and 由于 interchangeable in HSK 4?

Roughly interchangeable in meaning, never interchangeable in position. 因为 is flexible (clause 1 or 2, standalone reply, cleft). 由于 only sits in clause 1, never replies standalone, and most often takes a noun phrase like 天气原因 / 种种原因 / 工作需要. If the sentence shape doesn't match 由于's narrow grammar, the answer is 因为.

How is 因为 vs 由于 tested in HSK 4?

Three places: (1) 阅读 Part 1 选词填空 — 由于 is the literal correct answer in Test 06 Q49 and Test 08 Q50 (both with the 由于天气原因 collocation); (2) 阅读 Part 2 排列顺序 — 因为…所以 and 由于…因此 lock clause order; (3) 阅读 Part 3 reading — passages alternate registers, and identifying the marker tells you whether you're reading a news/formal piece or a personal anecdote.

What's the quickest way to remember 因为 vs 由于?

Five-second decision tree: (1) Standalone reply to 为什么? → 因为. (2) Cause is a bare noun phrase (天气原因, 种种原因, 工作需要)? → 由于. (3) Cleft pattern (是…的 / 之所以…)? → 因为. (4) Pairs with 因此/因而? → 由于. (5) Reason in the second clause? → 因为. Otherwise, 因为 is the safe default.

Can I always say 由于…所以…?

Yes, that pairing is grammatical. But the more polished formal pairing is 由于…因此…/由于…因而…. In HSK 4 reading passages, if you see 因此 or 因而 at the head of a clause, treat it as a 由于 signal — the writer is in formal register. Never use 由于…才… or 由于…就… — those clash registers.

What about 因为 + noun phrase like 因为天气?

Bare 因为 + noun is awkward in modern written Chinese. Spoken Chinese expands it: 因为天气的关系 / 因为天气不好. For a clean noun-only cause, 由于 is the natural choice (由于天气). On HSK 4 fill-in-the-blank, if the blank is followed directly by a noun + comma, the answer is almost always 由于.

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