No wonder: 难怪
Marks a fact the speaker had already noticed and found puzzling, now explained by a cause just learned. The cause is often introduced by 原来.
结构
（原来）+ 原因，难怪 + 已经看到的情况 ｜ 难怪 + 情况，原来 + 原因
讲解
本文中的中文词语都可以激活，查看词典释义。
， “So he lived in China for ten years — no wonder his Chinese is so good.” does not predict a result. It looks back at something the speaker had already observed — the good Chinese — and says that it is no longer surprising, because the cause has just come to light.
The two halves usually come with a partner. marks the discovery: “so that’s it”. The order is free — cause first and then , or first and then — but the roles are not: always sits on the observed fact, never on the newly learned cause. ， “No wonder you’re so happy today — you passed the exam.”
Because already carries the link between the two facts, it does not combine with . And because it explains something already seen, it cannot introduce a decision or a plan. means the same and is slightly more colloquial.
正确
Say each one out loud before moving on. The audio is a reference pronunciation, not a model to imitate exactly — match the tone contour, not the voice.
原来他在中国住了十年，难怪汉语说得这么好。原來他在中國住了十年，難怪漢語說得這麼好。
Yuánlái (second tone, rising) tā (first tone, high and level) zài (fourth tone, falling) Zhōngguó (first tone, high and level) zhùle (fourth tone, falling) shí (second tone, rising) nián, (second tone, rising) nánguài (second tone, rising) Hànyǔ (fourth tone, falling) shuō (first tone, high and level) de (neutral tone) zhème (fourth tone, falling) hǎo. (third tone, dipping)···
So he lived in China for ten years — no wonder his Chinese is so good.
外面下雪了，难怪这么冷。外面下雪了，難怪這麼冷。
Wàimian (fourth tone, falling) xià (fourth tone, falling) xuě (third tone, dipping) le, (neutral tone) nánguài (second tone, rising) zhème (fourth tone, falling) lěng. (third tone, dipping)···
It’s snowing outside — no wonder it’s so cold.
难怪你今天这么高兴，原来通过考试了。難怪你今天這麼高興，原來通過考試了。
Nánguài (second tone, rising) nǐ (third tone, dipping) jīntiān (first tone, high and level) zhème (fourth tone, falling) gāoxìng, (first tone, high and level) yuánlái (second tone, rising) tōngguò (first tone, high and level) kǎoshì (third tone, dipping) le. (neutral tone)···
No wonder you’re so happy today — you passed the exam.
错误 — 常见错误
These sentences are wrong. They are printed here on purpose, each one paired with the repair and the reason, because the error you can recognise is the error you stop making.
不太对
Incorrect sentence: 难怪他在中国住了十年，汉语说得这么好。
正确
Correct sentence: 他在中国住了十年，难怪汉语说得这么好。
为什么: 难怪 belongs on the fact that was puzzling (the good Chinese), not on the cause that explains it.
不太对
Incorrect sentence: 原来他昨天没睡觉，所以难怪他今天这么累。
正确
Correct sentence: 原来他昨天没睡觉，难怪今天这么累。
为什么: 难怪 already links cause and effect. Adding 所以 states the link twice.
不太对
Incorrect sentence: 外面下雪了，难怪我们明天不去公园。
正确
Correct sentence: 外面下雪了，我们明天不去公园了。
为什么: A plan is not a puzzle that has just been solved. 难怪 explains something already observed; a decision is simply stated.
对比
Most errors with this pattern are not errors about this pattern — they are a neighbouring pattern arriving at the wrong moment. Read these side by side.
所以 and 难怪 both join a cause to a result, but they look in opposite directions. 所以 reasons forwards: given the cause, here is what follows — 他在中国住了十年，所以汉语说得很好. 难怪 reasons backwards: the result was already in front of you, and the cause has just turned up — 原来他在中国住了十年，难怪汉语说得这么好. 难怪 therefore carries surprise resolved, and is often paired with 原来 and with 这么.
Cause and result: 因为…所以… →小测验
第 1 题 / 3总分: 0
Fill the gap: 原来她是老师，___ 她讲得这么清楚。