怪不得guàibude

Modal Expression 怪不得 (guàibude): No wonder

Meaning: No wonder, so that's why

Pattern

怪不得 means "no wonder / so that's why", expressing sudden realization of the cause behind an observed fact.
There are two common patterns: (1) Cause + 怪不得 + Observed Result (e.g., 他生病了，怪不得没来上课 — "He is sick; no wonder he didn't come to class"), or (2) 怪不得 + Observed Result + 原来 + Cause (e.g., 怪不得他汉语说得这么好，原来他在中国住过十年 — "No wonder he speaks Chinese so well; it turns out he lived in China for ten years").
Important: 怪不得 always introduces the RESULT clause, never the cause clause, and it is a fixed word that cannot be split.

1
他生病了，怪不得没来上课。
Tā shēngbìng le, guàibude méi lái shàngkè.
He got sick; no wonder he didn't come to class.
2
怪不得他汉语说得这么好，原来他在中国住过十年。
Guàibude tā Hànyǔ shuō de zhème hǎo, yuánlái tā zài Zhōngguó zhù guò shí nián.
No wonder he speaks Chinese so well; it turns out he lived in China for ten years.
3
原来今天是周末，怪不得路上人这么多。
Yuánlái jīntiān shì zhōumò, guàibude lùshang rén zhème duō.
It turns out today is the weekend; no wonder there are so many people on the street.

•怪不得 always precedes the RESULT clause and often pairs with 原来 ("it turns out") in the cause clause.

⚠️ Common Mistakes:

•Splitting the fixed word 怪不得 into 怪 + O + 不得.

•Placing 怪不得 before the cause clause instead of before the result clause.

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